Totally personal preference. I was also accepted to both and am going to Sinai, but that's because I like NY a lot more than Chicago, I think Sinai's curriculum will allow more flexibility and time for things besides school, and I sense that the faculty are unbelievably supportive of the students. Also prefer the flexible testing to exams that you aren't allowed to review afterwards. The Sinai facilities aren't the nicest (though the views are!), but I've learned from past experiences that it's not the quality of the walls that matter, it's what goes on inside them.