I use FreeOffice myself, mostly because it starts up super quickly (ready in under 5 secs) and has an interface that resonates with me.
Yes, LibreOffice is just as powerful and is much better known, but I find it takes nearly 30 secs to start up on my desktop PC. I also have challenges getting the themes to show the colours correctly.
The great thing though with free office packages is, you can install two, four or more of them and give them a good try out.
FreeOffice is not perfect, though, and one of the biggest drawbacks is the lack of an English grammar checker (there is a spell checker).
See https://www.xda-developers.com/5-reasons-why-freeoffice-is-a-great-microsoft-alternative