Honestly, its gotta be the MS Office suite.
Yes if you’re just writing your own simple documents libreoffice/OpenOffice will work, but if you have to do anything more complex than a single page spreadsheet, text-on-white presentations, or 3 page MLA book reports… or, even worse, have to interact with documents and spreadsheets created by basically any other person on the planet, I’ve just never had a good consistent experience with any of the free options.
Disagree but collaboration is horrible. Online Office sucks too though, they dont even try. They want people to use Windows.
Oh yeah 365 online simultaneous “collaboration” is absolutely useless. If I really need multiple people inside the same document I’ll use Google docs and then export it to finish off the formatting.