I used LibreOffice for years, but then I have moved to WPS Office Free.
We use xlsx, docx documents at work and they are completely broken in LO.
Mot to mention, that LO took about 10 secs to start and WPS does it in a sec.
Removing ADs/cloud took some tweaking, but I have managed to take care of that.
I'm using office 2013. It has an acceptable startup speed + native pdf support, may be useful sometimes
to be honest, I like office 2010 the most because of it's incredible startup speed without any tweak. At least twice faster than office 2013 and x3 than office 2016
I found office 2016 was super slow no matter how deep I tweaked it
2007 is still very good imo. The updates helped MSO 2007 alot for me so that macros wouldn't break. The only difference I noticed between 2007 and 2010 was the ability to open old Works documents in 2010.
MS Office 2007 on two PCs/Open Office 2 PCs/Libre Portable 1 PC
I would like to use Google docs, but I read too many horror stories on the Google forum about people who worked on a document offline, and when they came back online, all their changes were wiped out, without any hope or chance of recovery.