Hey, I was in your exact same predicament on Dec 1. After much deliberation, I chose UW because: I am an in-state resident (the total cost is literally half that of Pacific), the size of the class (56 vs 143), the conversations I had with current and former UW dental students and practicing dentists, a strong emphasis in both clinic and didactics (not too many schools are amongst the best in both categories), the networking opportunities if you are a WA resident leaning towards practicing in WA (UW is very strong, but UoP is also known for their outstanding alumni network), having friends already at the school, family in WA, Seattle, etc...
As for UoP, if I would have decided to attend there I am sure I would have loved almost every second of it. UoP definitely has something about it that just draws you in...and its real, but real expensive. UoP is three years, so if you really want to get out a year earlier, that is a plus.
So are you a WA resident or WICHE recipient? That might make a big difference in your decision. Good luck.