I had many PI's that I was interested in at both schools, so I knew i couldn't really make a wrong decision in terms of research fit and resources. It really came down to which school I think I would be happier at, since I will be spending the rest of my 20's at grad school. I enjoyed my visit to UCLA a bit more, since it was much more personal, and I feel like the graduate students there gave off a happier vibe. I also felt that the labs at UCLA are more graduate student driven, and I think that as graduate students we really need the attention of the PI in order to get the necessary training. I think UCSD would be a place that I'd be more interested in when I am looking for post-doc positions.