Once you get used to libreoffice ms office will feel like a gimmicky toy

You can easily change LibreOffice to have a tabbed layout like MSOffice (view > user interface). The only thing to note is that LibreOffice has great documentation, but it can be a bit difficult to follow with a different layout.

Nothing has exactly the same experience as MS. I don't think there is a clone project for it.

The two you listed are your best options.

Does LibreOffice have any issues that prevent you using it? If not, it's probably that your expectations are set by your comfort and familiarity with Office and that is the problem you need to solve.

You could always do in-browser Office if nothing else works. Or g-suite

@mypasswordis1234
OnlyOffice is good. Very similar to MS office

I think you'll be pretty disappointed with anything else that's available. Of those two I'd say stick with OnlyOffice.

honestly, I've only clicked on this post because of your username

"Foss Microsoft Office for Linux actually it isn't in Opensource"

Is there a reason a few are being developed rather than focussing on one? Are there key differences/use cases for each of them?

LibreOffice vs. OpenOffice vs. OnlyOffice

I remember once reading that one of them (or some other FOSS alternative) was bad for privacy/FOSS, but I can't find that anymore

OpenOffice

There is WPS office (from Kingsoft based in China).

Libre office was alright but tabbed layout was buggy, entering stuff in excel was delayed by 0.5s everytime, the math formula program required some esoteric knowledge, and libredraw messed up pdfs which foxit otherwise opened with precision. I stick to Microsoft office 2007 which does exactly what I expect.