Both are really good schools. Columbia, no doubt, has a bigger name--it is after all, ivy league. Columbia is also cheaper, though not significantly enough for me to consider.
The advantages for NYU, from my perspective, are as follows
1. Location is definitely better than Columbia. Columbia borders Harlem and is no longer what I consider part of the core of NYC.
2. Facilities--NYU is better. The size of their school and the number of international students lends to completely separate dental school and dental curriculum. NYU has recently created the Bluestone center for clinical research, which the largest dental research institution of its kind in the nation.
3. Friendliness of students and staff: I would go with NYU. As an HS advisor once told me, Columbia is an elitist institution. Many people who decide to go there are after the name and are gunners. Although I cannot comment specifically on the dental school, observing the environment closely during the interview is a must. If you are the type that do really well under pressure and scrutiny, then Columbia might be for you.
4. Curriculum: NYU. Sharing classes with medical students is the traditional way of teaching dentistry. As one biased faculty has told me, Columbia's curriculum is outdated. They teach you more than is necessary and what I refer to is not greater detail but excess information (about other parts of the body) that is not necessarily tested on the national boards. As a result, the clinical part of Columbia is totally lacking and residency is a must to become a practicing dentist. Furthermore, being with medical students who blow the curve, who have more time to study, who are simply smarter and who look down on dental students, in my opinion, can get annoying.
I know. More of the same. So sorry. But here's my deal. I'm in at NYU and have withdrawn from everywhere except Columbia because those are my two favorites. But I'm not sure I would go to Columbia over NYU and am considering just withdrawing so I'm finalized as a member of NYUCD class of '11 and won't have to worry anymore -- I'm supposed to hear from Columbia after I send in the NYU deposit. I know you're out there, but why would YOU choose CU over NYU (other than cost... that horse has been beaten to a pulp...)
Please keep in mind that I really LIKE NYU.
Thanks for the advice. Much love all around.
Mack