Yes, I understand what you say..location really doesn't matter to me as long as I have some friends to hang out with. The professor and research in the group which has accepted me in UCLA is really flourishing and so I am more inclined to UCLA in that sense but on the other hand, the stipend in UCLA is the bare minimum and in EPFL they really give you more than enough. I am also looking at the job prospects after I do a Ph.D. from either UCLA or EPFL. I think that UCLA would have more job aspects but I am still not sure about this. Reputation wise I think both are the same. So, if anyone can help me figure out the other things it would be really helpful.