Gotta love the X vs Y posts.
I'm a third year at nycom but grew up in jersey. I chose nycom over umdnj for a number of reasons.
First off, the governor of NJ is about to shake up the UMDNJ system along with Rutgers. He wants to model it after the Univ of Cali system. Nice idea on paper, but I dont want to be part of an experiment. There's bound to be growing pains. UMDNJ even lost a some faculty this spring as I remember b/c of budget constraints. That's the risk you take I guess for having cheap tuition for in-staters, your education is balanced on the whim of a budget cut. Anyway, mostly I was attracted to nycom's clinical affiliates, which cant be beat honestly. The class size is large, but I didnt care so much about that as I came from a relatively big undergrad school and I was used to fending for myself. As far as the class rank issue, NYCOM isnt ranked by number either, except for the top 15% upon graduation from what I hear in order to give out different awards and stuff. Compeition is minimal. From what I remember, the student government folks even handed everyone a CD with old tests and study aids on it. Old test questions are overrated anyway. Very rarely will a professor actually repeat a question. Living on L.I. can be expensive as this is NY afterall. NYC is a 25 minute train ride away but the campus is very suburban in a very safe area. There's about 35 hospitals affiliated w/ nycom, most in the NYC metro area, but about 4-5 upstate as well. Most students get one of their top 2-3 choices to rotate at, hence if you dont want to travel upstate to rotate, you dont have to.
anyway, enough for now. both are good schools. go wherever makes you happy.