Depends on you. What were your thoughts about both? They have different feels. Sinai is more academic focused, NYU is a little more clinical.
NYU has a new 1.5 year pre-clinic curriculum, which might be your thing. It's also connected to Bellevue and gets you a degree from a university with an established global name. Though, not particularly in medicine.
I interviewed at both and found I fit in more the Sinai crowd. I also found the basic science research and academic focus to be more apparent...and thought the facilities were generally better (housing, academic, some hospital facilities). I know money isn't an issue, but for me...Sinai was cheaper given the lower tuition and cheaper housing option.