Linux

I can explain the difference between X11 and Xorg with an analogy to the web and web browsers: X11 is like HTTP, Xorg is like the Chrome browser. X11 is the protocol, Xorg is software that implements that protocol.

X11 is old, it was designed back in the 1980s and includes messages for drawing lines and circles and fonts on the screen. Also, back then there were a lot of "thin clients", computers that were basically nothing but a browser, since graphics were computationally expensive and could not be done on the client computer, graphics rendering was done server side. There are lots of messages in the protocol for handling screen updates over a computer network.

Nowadays, all personal computers are powerful enough to render their own graphics, and no one needs the display server to draw individual lines or circles on screen. Vector graphics and fonts are done at the application level, not over the network. So these these messages specified in the X11 protocol are hardly ever used. Really, most of X11 (let's say 90% of it) is not used at all, only the parts where the keyboard and mouse are defined, and how you can allocate memory to buffer a graphic and copy that buffer to the display. But you still need to maintain the Xorg software to handle everything that X11 specifies, and this is just a waste of code, and a waste of time for the code maintainers.

So basically, they decided about 10-15 years ago that since no one uses most of X11, let's just define a new protocol (called Wayland) that only has the parts of X11 that everyone still uses, and get rid of the 90% of it that no one ever uses. Also, the protocol design takes into account the fact that most modern computers do all of their own rendering rather than calling out to a server to render for them. Also the Wayland protocol design takes into account that a lot of computers have graphics cards for accelerated graphics rendering.

Since the Wayland protocol is much simpler, it is easier for anyone to write their own software which implements the protocol, these software are called "compositors." Finally, 10 years after some of the first implementations of Wayland, the protocol and compositors are becoming mature enough that they can be used in ordinary consumer PCs.

So, I'm going for a long explanation just in case, just skip the parts you already know.

tl;dr: Wayland is more modern and potentially better, but development on the linux desktop is slow so some parts are not ready yet. You should use it for future-proofing, unless there is some X11 feature that you really really need. But you probably won't notice much on the surface. Check your drivers/desktop environment versions if you have flickers on nvidia, you need the very latest versions because of a recently resolved issue.

Backstory:
Xorg is a program, X11 is the protocol used by said program. Xorg is old, insecure, inefficient, it is based on an idea of how graphics work that is outdated and doesn't reflect modern hardware. But most of all, its code is a mess, and it is impossible to update it to fix those issue. Thus, the Wayland protocol was born as clean-slate replacement, meant to solve some issue (make it more secure), clean up the software (Xorg is unmaintainable), and make it reflect the way modern graphics work (less intermediary, no network transparency, no per-vendor implementation), but as a consequence, it breaks compatibility with old software.
Also the developer of xorg were so traumatized by x11 that when making Wayland they went to much in the opposite direction and were reluctant to implement some features, most of which have now been added as protocol extensions or separate software, but some are considered against the protocol design principles and will never be implemented. One of the differences is that there's no standalone display server, but you have a window manager+compositor+display manager, so Desktop environments need to make their own or support the one made for other environments, that's why only a few of the long-standing DE support wayland, for now.

What makes Wayland good (plus drawbacks):
Less intermediaries mean theoretically more efficiency, thus speed. Of course, that is only true if the compositor is mature enough, after all X11 software is very mature.
In ye olden times every vendor provided a closed source implementation of the x11 protocol, and that's how drivers worked. That is objectively a bad idea, so during the years glamor was developed, to run Xorg directly on OpenGL instead of on an ad hoc driver (put a pin on this for later). In Wayland you don't need ad hoc drivers, they just need to provide Egl (not to be confused with EglStreams) and a library called GBM, that are used for managing frame buffers.
Xorg used to manage a huge part of the devices (even printers...), and due to antiquate design, it was unable to handle trackpads correctly (e.g. no proper kinetic scrolling), Wayland does less, and relies on other more modern input management libraries, this theoretically allows input devices to work better, but only if the related new libraries and protocols are ready. E.g. he trackpad part is ready, the drawing tablet part is not.
It is more secure, for example it doesn't allow programs to just read the screen. It is absolutely possible to do screen recording, but you need modern software, and some applications (e.g. discord) are really reluctant to update their libraries (discord is using electron from 2018), so they don't get recording. A problem is that it doesn't allow applications to move windows, some protocols are being worked on, but right now, software that relies on moving or placing windows will not work.

Applications (plus possible work around for freetube):
Most applications using modern libraries and toolkit don't need to care about Wayland support, the toolkit will do the job. They might be undertested on Wayland tho, and small projects might not have the resources to test and take care of both protocols, so they will choose X11 because it's still the most used.
Most older applications also don't need to care, because Xwayland works just fine (put another pin on this), but sometimes they are a bit broken. And if they are specifically tools for xorg (e.g. xscreensaver) they will of course not work.
Some times electron apps still have issues, because chrome has not had proper Wayland support for a long time. More over, Google does make a version of chrome with improved Wayland compatibility, but they ship it with chromeos. You might fix some issue by adding --disable-gpu which disables electron's gpu support.
Expect proprietary applications to not fully support native Wayland, because their vendor often don't care.
Java applications don't support native Wayland because AWT is fundamentally incompatible with Wayland. JetBrains is working on a replacement.

Nvidia, Xwayland, and Glamor (this probably concerns you):
Recall the pins from before.
Nvidia provides it's own proprietary implementation of X11, like in ye olden days. When they decided to support Wayland they decided that they wanted to use Egl+EglStreams instead of Egl+Gbm, but only gnome implemented partial support for eglstreams (so it was basically unusable), they refused to support Gbm for many years, untill about three years ago for and suddenly you mostly could use wayland on Nvidia but some things were broken, and especially Xwayland was broken and flickery. Many things were fixed but not xwayland.
Nvidia refused implement the Implicit Sync (from now IS) semantic, which was (until a couple months ago) required by linux's standards. That is to say that their drivers did not respect linux's standard and were incorrect. IS is not a good semantic for modern graphic, but that was the standard and there was no alternative.\ No one noticed for a long time because Nvidia provided it's own implementation of X11, but xwayland uses glamor which glitches when IS is not implemented causing flickers. Actually this affects everything, but for some reason xwayland is more affected.
During the past two-to-three years Wayland developers worked along side nvidia to come up with a new Explicit Sync (from now ES) semantic. ES is marginally better for IS, but most of all, Nvidia is fine working with it, so now the flickering should be fixed as well.
Why does your xwayland windows flicker? Applications can support ES and get 0.001% better performance even if they shouldn't need to (because of how it was designed), but what you need is support from your desktop environment, and from your drivers. You need the latest version of Xwayland, and Gnome 46.1+ or KDE 6.1+, plus nvidia drivers 555+. If you have those versions of the software, everything should work, if not expect flickers and wait for updates.

At the very beginning in early 90’s Linux adopted X11 implementation that was XFree86. It was obvious and pragmatic move, because Linux was UNIX clone with full POSIX standard compatibility, and X11 was already there for almost a decade. Porting it allowed for having graphical interface very early on (Linux started in 1991, X11 support was added one year later) and allowed all the contemporary UNIX software to be easily ported to Linux.

X11 however was designed with completely different needs in mind, as UNIX machines were mostly mainframes or powerful workstations and not home computers. It was about a lot of features that make no sense in this day and age (like network transparency, drawing primitives, printing capabilities, font rendering etc) and its design aged like milk. Xorg (that was fork of XFree86 started after license change) was implemented in a way that allows keeping compatibility for the time being with many issues being worked around and the old solution being effectively forcefully framed into modern use. It’s basically huge

Wayland started as an idea on how to do graphics on Linux (and other UNIX systems) without X, but it was never meant to be drop-in replacement. That being said, it’s vastly incompatible and the shape towards having Wayland desktops is long process of gradual implementation of new protocols to make it complete eventually.

Making Wayland possible took redesign of the OS itself. In old days, Linux didn’t think much about graphics and it was the monolithic X server that took responsibility of things like loading video drivers, setting screen modes or pushing stuff to video memory. Wayland was all about split of X’s features outside of X to gradually remove the dependency, so now the kernel has native system interfaces like kernel mode setting, direct rendering manager and so on. It’s not only Wayland taking advantage of it, as the same infrastructure is now used under X too.

Your experience wasn’t much different because it wasn’t meant to be. Desktops that are ported to Wayland are very good at abstracting things that are specific to both (otherwise completely different) display systems. You can gradually find about some things being different over time as you dive deeper.

There are certain limitations of X that Wayland doesn’t have:

• X cannot handle multiple DPI settings, so it is only possible to set one scaling factor globally for all monitors no matter their size/pixel density
• X could never properly handle multiple refresh rates for different monitors
• No way for proper HDR support on X
• VR is not really a good idea on X

On the other hand, X is very open to the user and applications, providing all sorts of information about opened windows and sniffing input globally by any client (focused or not) is a feature. In 1984 no one really thought cybersecurity will be important factor. So on Wayland:

• App can’t keylog keyboard presses or mouse movements unless its window is focused (global shortcuts are still unsolved issue, WIP)
• App can’t directly control its window position and size as it is only controlled by compositor (the idea is to introduce protocol for asking compositor on window positions relative to some area, it’s WIP)
• App cannot get image of screen or window (this is solved via PipeWire video capabilities and xdg-desktop-portal)
• Any GUI automation is compositor-specific, at least for now.

For those and other reasons (like availability of desktop environments and window managers), some still prefer Xserver.

The biggest benefits of Wayland over Xorg are to the developers maintaining it, not to the end user.

The Xorg project has become difficult to modify for new features and fixes and so they've decided to rewrite it.

As a result users will eventually see some benefits as Wayland implements features that were difficult to do in Xorg over time. But in the meantime it's causing everything to be rewritten to support the new standard. And it's a pain in the ass.

If your application works as you want on Xwayland there's no reason to try to get it to work on Wayland native. Xwayland won't be going away anytime soon. Eventually those applications will just switch over to Wayland and you shouldn't need to think about it.

It's not something that you can really experience directly as the end user. It's a base on which other features can be built. Most obvious would be fractional scaling.

I can name one improvement: global scaling works SO much better in Wayland

But obviously if you don't have a high DPI monitor, this won't matter to you

You already understand. Wayland isn’t there yet.

Wayland should be faster. What would you expect to happen? It should just work, while in the background EVERYTHING is changing.

For Freetube, it should automatically detect running on Wayland and use that. But I had one bug on Freetube only on Wayland, may be an Electron issue.