how many of these threads does there have to be?
for PI and government, i would rate them about the same.
for biglaw, i would give the edge to UC Hastings.
for prestige, i would give the edge to UC Hastings.
for environment, it would depend on whether you prefer the city (UC Hastings) or a more suburban environment (Davis).
for out-of-state employment, i would give the edge to UC Hastings.
for alumni, i would give the edge to UC Hastings.
with all that said, i know people from both who are doing great in CA so you have two very good options.
good luck.