As echoed in previous emails from my colleagues, as a Sinai resident, I cannot comment on the program at NYU or at any other institution. What I can say, however, is that I cannot imagine another place more supportive of the residents than Sinai. Our program director makes certain that our education and well being here are absolute priorities, and he does everything he can to ensure that every clinical experience you have is one that you can learn from. There is no using/abusing residents just to get the work done.
That said, the hospital is extraordinarily busy, and there are long days that will wear on you. This is residency, after all. However, the environment here is supportive and rewarding, and there is always a friendly face to turn to at the end of the day, whether that be our program director, one of the attendings, or a fellow resident.
At the end of it all, the training here is intense, thorough, and clinically superior, and the faculty and administration here are more than willing to speak up on our behalf when it comes time to look for jobs.
Ultimately at the end of the day you have to choose what feels right in your gut. But hopefully these comments have given you a better idea of what Sinai is all about. Best of luck!