I agree that either school will probably be a great fit; it's really hard to go wrong, and your college experience at either school depends a lot more on what you do with your four years there (what activities, etc.) than where you are. As a Princetonian, though, I'd have to give a stellar endorsement of Tigertown!!
If you're looking a more accurate sense of Princeton's unique vibe than is evident on the school's website, I recommend that you check out The Princeton University Press Club's blog, The Ink
. The blog has daily postings about campus goings-on, Princeton in the news, and all of the little idiosyncrasies that make Princeton such a great place. As an undergraduate, I use the site a lot, and I know that if I'd been aware of it during my application process, it really would have helped increase my interest in the school and vanquish all those pre-frosh fears I had about Princeton's social scene.