I was EXACTLY in the same situation last year....
I was accepted to both LLU, and USC last year and had to make a decision. I chose USC.
There were several reasons why I chose SC over LLU. The thing that sealed the deal was I went on a second tour of the school during the spring (before I made my final decision). This part is totally my decision, I did not get a good vibe from the school. LLU is unique in their rules and practices...Im sure you know them/heard of them right now (if you dont read other llu posts to find out)
I did not feel that I could live there for 4 years. The community looked like a small town out of middle America. There is not much to do in terms of night life (I am from LA). The school itself.....the clinic was really nice....chairs looked nice. the pre-clinical labs were another story, it is located on the basement floor of an old building....the roof is low...all years of dental students were cramped like sardines in the lab, i did not like that at all b/c your first half of D school concentrated in the labs.
Tuition for llu is about 40-45K and with living is probably close to 55-60K. I currently am living at home so the cost basically would be the same in either case.
PBL works, its just of matter of being motivated to self-study, and just adapt to the program. SC pumps out good clinicians...and so does LLU.
Thanks all I have to say for now.