LibreOffice is useless for me. It has neither the math nor the graphing capability of MS office. Today I’m working on an excel spreadsheet with a half million rows and a dozen columns, and it’s a short one. I even uncovered a bug in Excel365 using it.
I use RealOffice and I'm pleased. It is free; the only problem I've had was it crashes once in a while when I am too fast a do too mant things at once. But I've never lost anything - it backs up everything and recoups everything so I don't lose anything.