I'm a Bay Area native, but went to an Ivy undergrad and worked in NYC for two years. Currently I'm working in China.
Both schools are ones that I could see myself going to and I love Berkeley and NYC. I think Boalt has an edge in quality of life (the weather!) and obviously cost (I'm still a California resident). And part of me wants to settle in the Bay Area.
However, I have an interest in international law, and I'm not sure if the Berkeley name will go as far as Columbia's outside of the U.S. Also, Columbia has a Center for Chinese legal studies and lots of study abroad programs. However, Boalt's lower cost might give me more flexibility to do more things by virtue of having less debt to pay back (and not be trapped by the Big Law track).