Some people say the rooms are too small, but if you pick the right residence halls, you'll have plenty of room.
South campus is MUCH more social, and there's always stuff happening. South campus dorms are a further walk to class, but it's barely noticeable. Ram's gym and dining hall are really close too, as are Kenan Stadium and the Dean Dome.
Stick to Hardin/Craige North for dorms. They're the two newest, have the biggest rooms on South campus, have internal hallways, and you have to share your bathroom with only one other room instead of 3. Koury/Horton are older versions of basically the same set up. But it's easier to be social in internal hallways.