I would most likely go with UF. It as a reputation for being one of the most academically rigorous and research-oriented schools in the state with respect to medicine and the natural sciences. It also is well-established for premeds.
That said, an argument can be made to go to FSU. A previous poster brought up the fact that there are a ton of highly qualfied premeds at UF-- It has one of the highest number of National Merit and International Baccalaureatte students in the country. Let's face it, this is a numbers game. I would guess that there is a smaller pool of premeds at FSU although I have no data to back that up. if you are reasonably strong, you could argue to be the "big fish in a little pond" at FSU. All things equal... in my experience, that actual numbers of a class rank and GPA are taken into account a little more than the amount of time/effort/craziness (due to school rep/rigor of curriculum) in getting that GPA (sad but true).
Of course, you'd end up being a seminole... that's probably the deal-breaker😀