You'll lose more than just snapshots, btrfs does a bit more than just that.
I've been running my NAS/server on btrfs for years, now. I started out on Rockstor (which was still based on CentOS back then, they switched to an OpenSUSE core some years ago), later I decided to roll my own setup on Leap, partially because I already had (and love) Tumbleweed on my workstations, and keeping everything on one distro is just less mental overhead. For me, it's been rock solid. I like OpenSUSE, I like btrfs. Snapshots have saved my bacon on the workstations more than once when bleeding edge updates and nvidia clashed; it's never been an issue on the server of course, and I don't really use them for data (although the option is there). I do however use RAID1, on 3 drives, and being able to just add a drive even if it's not the same size as the others (within reason), is a big plus and one of the reasons I opted for btrfs back then.
OpenSUSE as a distro is great, there's a fair amount of software, stuff that's not in the default repos might be on OBS. It's a fixed-release distro but the cadence feels somewhat different from Ubuntu's. YaST is great when you want to have some easily accessible menu driven interface to setting things up, rather than poke around in config files (I'm more of a config file guy, but having the option is nice).
Of course, as for opinion... It all depends on what you want to use the machine for, where your experiences lie, and so on. What's the NAS doing, besides file shares, what do you hope to gain by switching distros? Where are you on the scale from "I want it to just work, something like a Synology would be nice if they weren't so pricey" to "I hand-compile kernels for fun"?