I bought myself Ultra Sun yesterday evening since last time I went with Moon! Ended up naming my trainer after one of my OCs and since I chose Rowlet in Moon, I went with Popplio this time. I haven't gotten too far into the game yet, I've only just beaten Ilima. So far I'm really enjoying it though! I'm glad they've put more Pokemon into USUM, it gives the routes some more variation as to what you can encounter.
My team currently consists of a level 15 Popplio, a level 14 Rockruff (from the event), and a level 14 Zorua.