Columbia was as impressive as you'd expect, the Dean who is very young was especially impressive and the facilities and profs are top notch of course. Still, I preferred the atmosphere of and around NYU. More a personal thing than anything else though I guess... I should add that the NYU buildings were also extremely nice, one renovated, the other new and their profs are, of course, also leaders in their fields. Columbia's faculty house did have better food than NYU's though in case that's a way to pick a school.