UM and UF are very close to each other in most aspects, such as teaching, curriculum, and research opportunities (although UF has a slight edge in my opinion in research). However, one main difference between the two is the patient population and patient care experiences. For UF, you're mainly in Gainesville (a very small town) or Jacksonville for clerkships and rotations. The reason UF sends its students to Jacksonville is because of the bigger population, hence a greater variety of illnesses and procedures students can see and learn about.
UM's hospitals are located in the heart of Miami. As you're aware, Miami has a VERY diverse population (much more diverse than Jacksonville and Gainesville combined). As a result, there are more illnesses and rare conditions that you can observe in Miami since there are people from nearly every corner of the world in Miami. Also, Jackson Hospital (UM's primary teaching hospital) is a large community hospital. It is fully funded by the state and a patient does not need health insurance to be viewed in Jackson. Due to this, the patients that students observe in Jackson are usually very ill. Many individuals even fly in to Jackson from South and Central America to receive treatment. Due to Jackson's large size, students get a lot of hands-on experience.