It's all about what type of school you want - smaller classes, more rural college town, or larger classes in a large city.
Where are you going to be comfortable?
Obviously Hastings had the advantages of being in the Bay Area, and it has better placement because of it. Davis will place there, but tends to place in Sac. or elsewhere.
Hastings has a more professional, business feel to it, and offers a great many clinics, externships, and some great professors. Davis seems to emphasize public interest, environmental law, and human rights stuff, though you'll find no shortage of that stuff at Hastings. Hastings also has a larger course selection, and allows you to take courses from other schools in the area.
I wouldn't put too much stock in the competitive/laid back dynamic between the schools, but I would say that Davis has smaller (and more intimate) student body. It's supposed to be extremely friendly.
Both offer excellent LRAP programs. Hastings has the larger network and more reputable name.
I'd visit. It's the only way you'll know.