Linux

No issues here. Have to use (mainly) excel at work, but use libre office calc at home, for years. Hate excel with all my heart. Mainly autocomplete and UI issues, but also issues when using more than one instance with excel. No problems with file exchange, p.e. with my tax person. Imho excel was THE leader but they enshittyfied it to the max.

Libreoffice is strongest when you're using ODT format because it's an open standard. It's not at all their fault for docx incompatibilities because they change the format CONSTANTLY and of course their only documentation is internal.

Personally I haven't had those issues though, only slight formatting differences when opening docx files, and half the time it's because I didn't have the font installed. You can change to the ribbon style if you really want but personally I prefer the older style, I find it's easier to find what I want.

No issues as long as you switch the toolbar to use tabs or contextual groups instead of the insane button overload which is still the default for some reason.

I use Word at work and OnlyOffice and it works perfectly fine for my needs.

I don’t see any reason to go back to any proprietary software at home 😇

If you need MS office compatibility, don't use Libreoffice. If you just want to use the software for your own documents, Libreoffice is (imo) better* once you get used to it. If you need Basic Excel macros, Libreoffice won't work unfortunately.

(*) the thing I hate about excel is that everything works "like magic" which is fine as long as it works. When something doesn't work, you are screwed because you cannot explicitly tell Excel what to do. It wants to do its own magic instead of obeying your will.

OnlyOffice is good. Better compatibility with MS office and nicer UI than libreoffice.

I've been using libreoffice for several years, and when I have to cowork with someone, compatibility issues always happen. However, since last year, I've been experimenting transitioning to onlyoffice for a few academic works, and it has been so smooth. So far, I opened all documents people sent me without issues, and published some works, and no one involved in the process complained about anything. If you need compatibility with ms office, I suggest using onlyoffice. It's also foss and can be used at most OSes, even on android.

Edit: I see that other people already suggested onlyoffice. I didn't mean to sound like those pushy comments that appear on our inbox from people saying the same thing again and again.