After having used MS Office for a while, I have to admit that LibreOffice just feels more pleasant to me, when I don't need exact MS compatibility - the UI is customizable, Calc doesn't mess up CSV files when I open them, Writer also has most of the features you need and exporting PDF files is nice and has none of that OneDrive bullshit with them almost trying to hide your local file system as some secondary target.

That said, in some hardware configurations LibreOffice has slow and laggy rendering (you have to mess around with rendering settings, hardware acceleration and Skia and so on), some features like bibliography have broken on me in odd ways, and Impress can be a bit slow for larger presentations. OnlyOffice feels like it has more polish in regards to how approachable the UI/UX might be to a MS user, but feature wise isn't that far off.

I personally wouldn't reach for MS Office unless I wanted it as a part of their overall groupware - mail, Teams, AD and a bunch of other integrated stuff (though aside from AD, most other things feel a bit jank, like the new Outlook or Teams in general when compared to Slack).