UW(udub as they call it):
Pros: Great medical school in terms of research,clinical work, and primary care/rural medicine (#1 in this field). Just broke top ten, but has been a perennial top 15 school for as long as I can remember. Curriculum is pretty tough (about 25+hrs/week) and very traditional, but students say it prepares them well. It's the only med school for a five state region, so you see lots of cases from a very diverse population pool. Great quality for the price - they even try to offer the few limited out of state acceptees enough scholarships so that their tuition lies in par with an in stater(at least that's what they told me during the interview).
Cons: Weather (very rainy/overcast throughout year), curriculum, heavy in-state preference, pretty tough interview.
UCSD:
Pros:On the rise school (just broke top 20). Also very heavy into research, and average (as far as I know) on primary care. Curriculum is changing, but known to be pretty rigourous, but nothing to take exception about. La Jolla is a really posh section of San Diego, but it's centrally located to many nice destinations. Tuition is cheap (like all UCs). Don't accept as many out of staters as UW (check MSAR, probably about 3 or 4 a year), so there's a huge Cali contingent there. Their student run clinic is a great way to begin to get hands on experience early in your studies. Weather is very nice. Interview is laid back.
Cons: (Some would say)rigor of curriculum, heavy in-state preference, bland appearance of the medical scool.
BOTTOM LINE: Both are fantastic schools that will give you an excellent education and prepare you very well for your residency for not a lot of dinero. Good luck.