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.
I can't speak for the whole suite, but Excel sucks in the browser. The browser version do not have all the same features as desktop. I only use Office if I'm forced to and use LibreOffice or Latex otherwise
I am currently forced to use Excel online for work. Such a frustrating experience. And I can't even edit it offline, because the conversion between two languages and two versions doesn't work properly.
Libreoffice has it's problems too, but it feels much more 'friendly' somehow.
I found onlyoffice to have the best compatibility with documents imported from/exported to MS Office. For most people, their coworkers/teachers/professors or whatever will be using MS office, and if the formatting is borked everytime you move the file between libreoffice and ms office users, it gets old fast. That was my experience with libre office and why I ended up on onlyoffice. Of all the suites i've tried it has the best compatibility between itself and ms office for formatting.
Basically the only commits to OpenOffice now are things a full project lint would catch. There are some security updates here and there. Last I looked it’s basically one dev fixing spacing.
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
Not sure if you're thinking of WPS Office (formerly known as Kingsoft Office). It's development is funded by the Chinese government, but although Kingsoft claim that the Linux version is developed by the community, they haven't really published the source code anywhere, so it's considered a high-risk software.
No, it didn't. FreeBSD didn't exist until 1993. 386BSD wasn't until 1992. Linus has said that if a free, unencumbered BSD for PCs existed in 1991, he indeed would not have made Linux.
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.
Between the two I recommend OnlyOffice because it has better export compatibility,, a PDF editor, seamless interchange between their desktop, mobile, and web versions, and a nicer UI.
You'd only need LibreOffice if you're doing very advanced document formatting or very niche scientific or financial formulas. LibreOffice has been around for a lot longer than OnlyOffice so its got more edge use cases figured out. Onlyoffice is more modern and IMO feels like a smoother experience with the UI.
I don't use these kinds of tools in private unless I have to, and when I do, I found that OnlyOffice has better compatability with .docx-files. I recently had to make some changes and format a .docx-file, and after struggling to make it look correct in LibreOffice*, it did not show up correctly in Word. Output was more or less the same in OnlyOffice as in Word, and after redoing it in OnlyOffice, it looked almost completely correct in Word.
This is, however, always a problem with these kinds of programs in my opinion.