Having interviewed and talked to students from all of those schools, all of those schools are Cali friendly. I don't think you should be worrying about whether any med school is cali friendly or not. Rather, chose the schools you apply to on a broader set of criteria: geographical location, type of teaching hospitals or clinical experience they offer, cost of attendance, cost of living in the surrounding area, etc. I know Einstein for sure has a LOT of cali people, but I think NYMC tops both BU and Einstein for having the highest percentage of cali people. They're all great schools, depending on what type of clinicals you are looking for and what type learning style fits you. (The learning style for NYMC is not the same as BU or Einstein.) Good luck!