It's subjective. LibreOffice UI is why I stay away from MS Office. I can't find anything in MS Office anymore, I have to rely on their "search for command" feature (or whatever it's called) to be able to do anything. LibreOffice is mostly intuitive for me. On the other hand, my father does not like it and keeps nagging me to buy him the MS product (I can't justify the costs for his casual use though).