Hate to break it to you, but the deadline for responding to offers from both of those programs passed in December. Unless, of course, you just got one or both invitations. OR unless, you accepted both, but were just holding out until the last possible minute to give up your spot, preventing someone else from having it. But I know nobody would do anything lame like that, so forget I mentioned it.
As far as your dilemma, warm v. not-so-warm; expensive v. exorbitant. Coin flip works for me. Best of luck.
-Grizzle-