This is perhaps getting too nuanced, but Poco & Mom's (which is a great place by all accounts) gives a nod to New Mexico flavors, so I am not sure if it moves them down the list a bit if we're looking for local cuisine?
I used to go to Boca a lot when it was at the old Greasy Tony's location, but haven't been since it moved. Has anyone else been? (I'm happy to do some scouting this week and head down there for lunch one day.) As El_Chiflero mentioned, we may need to consider size/space as we narrow down the selection.
El Charro is a solid option for groups, although I recall another Do there, so in case there's a desire for someplace new, I'll throw out an alternative - Micha's. It is in South Tucson (near the arguably more well-known Mi Nidito). It is not going to win any prizes for ambiance or menu creativity, but they've got solid Sonoran Mexican food, cerveza, easy parking, and plenty of room for tables of 10 or more. (
menu)