You're in state for UCSF?
Your decision has been made. 🙂
Regarding the friends thing. Even if its "clicky", its important to realize that this is professional school and that you're there to learn dentistry. Dentists need to be personable people, and as such you will make friends no matter where you go. Every dental school will give you what you need to start your career, and that's your degree.
Go to UCSF.
Keep in mind the difference is most likely more than 70,000. Did you factor in a 5% increase per year in tuition and fees? Interest accrual on loans? The true difference is probably 100,000ish.