I can't provide much input on Stony Brook, but I've had a bit of experience with Drexel. I was going to go there for a graduate program tied to their medical school, but chose to withdraw due to personal reasons. Speaking from completely personal experience they were extremely unorganized and all of the current medical students I spoke to pretty much said the same thing IWannaGoFast's friend said, "med school is med school." Which I get, but I think that being happy is also part of it. Drexel is a great school with many opportunities, but just based on those I've met, they don't seem to love it. I felt like they weren't convinced they had made the right decision. Take this all with a grain of salt, as I'm sure you could love any of them. Perhaps I just talked to the wrong people.
I also have two friends at TCMC and they both seem to love it. They feel very involved in the surrounding community and love that they can just take a weekend off and journey to NYC or Philly. It's a newer school, but it's coming along.
Either way I'm sure you'll make the right decision, congratulations!