My Plex server runs Ubuntu / Unity most of the time. I also have MATE on because that was the only desktop I could get to work with X2Go. If I'm not in X2Go I prefer Unity - it seems cleaner. Maybe I just have Unity configured as I like it and I haven't given MATE a chance.
I'm planning on a gaming Linux build in the next month or so, and might be more adventurous. But Mint had that big security breach - Arch is too bleeding edge. Decisions, decisions.