Although USC is not one of my favorite schools, I still think that it does provide better dental education compare to UOP. UOP does not have specialty departments (such as endo, ortho, etc.) so you'll get to do lots of things as a dental student. However, if you do want to specialize in some field after the dental school, it would be wise to attend an institution with comprehensive specialty departments. USC tend to take their own students into their specialty programs. Although I'm not exposed to the PBL program, I think it's a great way of learning. Just a thought.