I use both and prefer libre except sometimes it messes up the formatting of Word docs if there is some kind of elaborate layout with pictures. Other than that it transparently opens and writes valid .docx etc formats. The Excel clone is pretty usable for an amateur like me.

I've used Libre Office (and Open Office before that) for years, on and off. I briefly used it for my main office suite. Interesting differences, and mainly down to personal preference I suppose, but I always liked MS Office best. I can see why things might be the other way. It wouldn't break my heart if I was "stuck with" Libre Office.

Mind you, when I started work we had a typewriter for everyday letters, and most memos were written with a pen. 

I like LO because it's free, and also because I hate Microsoft and the horse the it rode in on.