sorry, i really don't know all that much about pitt, but i do a thbing or two about sinai, and i think many of the posts here come from people who have recieved misinformation. to clarify:
1) most of sinai's patients actually come from spanish harlem, so if wind up at sinai, you will spend the vast majority of your time taking care of a very diverse and under-served community. this also means lots of hands on experience. in terms of affiliates, sinai has more hospital beds per student than any other medical school besides harvard. they also have the third largest faculty/student ratio. all this means that students at sinai get tons of clinical experience, including both private and public city hospital where the students and residents pretty much get to run the show.
2) sinai has one of the largest nih sponsored mstp program in the country and they are adding more md/phd spots next year (within a few years the % will be close to 1/8th of the class). in other words lots of research. plus last year, the school generously funded over half of sinai's first year students to stay on campus during the summer and do research.
3) reputation: i am not really sure how to measure this but i know sinai's is very strong and is constantly improving. as for the caliber of students in sinai's first year class, i think their qualifications speak well of the school's reputation (gpa=3.67, mcat=10.8). in fact, i am not sure what pitt's stats are, but i don't think they are that high (though i am sure they are still quite respectable).
4) cost of living: even with yearly price hikes, i think sinai's tuition is significantly lower than most other schools (including pitt). plus sinai offers tons of financial aid and even a couple of full-ride merit scholarships. so i am not sure that spending four years in the city of pittsburgh (or any other similar town) will translate into money saved. in fact, sinai probably is less expensive. and, you get to live in the heart of new york city, right next to central park. pretty good, if you want my opinion.
5) finally, sinai is very relaxed and has one of the most "chill" curriculums in the country. and students there are very happy.
so those are the facts about sinai. i didn't mean to be so wordy, but other people who have posted have gotten some of their facts wrong about sinai while trying to prove their point about how good other schools are. like i said before, i don't know all that much about pittsburgh, but i still think that when the facts are laid on the table, sinai stacks up quite wll with almost any other school in this country.
that being said, make whatever decision you will based on the facts at handf and on your own first hand experinces. talk to students at both schools and get a feel for what they are like and what there school is like. med schools tend to be small and people on the outside usually only know the most superficial things about each, so invest the effort to look a little deeper. and then decide for yourself.
best of luck