I'm on the waitlist for both UCLA and UoP... lol So which ever you decide will be good for me!
UoP: 3 years. Great location. Awesome new facility. The cost of living is a lot more expensive, but also remember that you're paying one less year of rent!
UCLA: A lot cheaper. Great for research. Great for specializing. And if you'd rather do 4 years with longer breaks and less intense curriculum(this just depends on your preference). I lived in SoCal and loved it(especially the beaches!). The only thing I don't like is the traffic, but if you're living near campus, I guess that's not really an issue.
Going back to you're OP: My sister just graduated from Western and received a number of offers. She signed with an office in Phoenix, AZ and will be making $150,000 during her first year. That's about the average amount of a new graduate dentist, I heard it could be lower if you stay in California. After taxes she'll probably take home $100,000-$110,000. After cost of living $80,000-$100,000
So subtracting that from UoP's cost of attendance(assuming you use the full $28,800/year for cost of living): $439,807 - $100,000(4th year salary)= ~$340,000
Good luck making your decision! I hope this helps a little! Please let us know what you decide because these are both my top choice schools!