Obviously I'm not a student at either because we've been talking on the other forum, but what are you trying to decide between them. I got into both, but I'm definitely not going to USC (I'm trying to decide between Duke and UCSF- leaning towards UCSF). They both had good research facilities, but the students at USC didn't seem actually involved in research unless they wanted to be, whereas at UCSF you're required to be. I thought USC was too expensive. Also, I didn't like that most of the classes were in the basement- I need windows! It does suck that UCSF is on 3 campuses but I looked at their schedules online and sometimes you're at 1 campus all day.
You can PM me if you want to hash it out more! Always good to talk about it (I'm getting opinions from everyone I know haha).