OnlyOffice has a great design and is quite performant as well. OnlyOffice, I believe, integrates well with NextCloud which is also awesome. I actually use it for a couple of my devices, but I wanted to keep the list simple and I indeed had a big debate on my head which office suite I put on it.

I think I ultimately chose OpenOffice because OnlyOffice's design seems like it could easily trick you into thinking you need to go into a paid version.