While I have since come off the WL elsewhere, I originally decided to go to NYU over Einstein, mainly for the reasons people give elsewhere. Location was big, facilities and money struck me as significantly better at NYU, and I felt much more at home at NYU than at Einstein. I also had a terrible experience at Einstein, where my interviewer decided to ask if I had a learning disability because one of my grades was incongruous. This made her hand-written note seem slightly disingenous. In general, Einstein struck me as run-down, in the middle of nowhere (relatively), and inferior research-wise and clinically. Finally, NYU is attached to what I would consider a more major undergrad university, allowing better extracurricular opportunities, if that's what you're into.
Hope that helps.