Uf is probably the best medical school on paper, but definitely not a nice environment. everyone's a gunner there and the whole grading system in on a curve. they dont care if you are failing either. they have the whole 'survival of the fittest mentality'
UM is a pretty decent medical school, more respected than USF but deals with a huge spanish population obviously. They do a lot of work at Jackson Hospital which is a so-so hospital imho.
USF is under new leadership with some new faculty members... Not the best med school but a lot of great hospitals in the area for training.
If I had to make the decision, I might pick UF just because I know some people there that could help make my first year a lot better than it would be otherwise. That's a tough decision either way. If I were you though, I'd choose UM