In your position, probably my first step is to decide what is more important to me (you). Are you thinking about going into a highly research-heavy, academic career? into a fellowship? if so is it a competitive fellowship or less so? 90% of the time this is going to dictate where you end up. If any of those things are important to you, then not only you don't have a lot to choose from, but also you should consider expanding your options to nearby states so you have backup options. That is not to say that you won't learn a lot from a community hospital-based residency or that your chances for the fellowship are not good. I did my residency in a community hospital and the 3 classes in front of me and my own class all matched into their fellowship of choice including some prestigious institutions and competitive fellowships such as GI, Cards and Critical care.
I think once you have that figured out, the choices become more clear. If you are planning on stopping after your residency and being an internist, there is certainly plenty of value from getting your education from a more respected university hospital, but at the end of the day, if you are going to end up practicing 40 years in a community hospital, the value of 3 year residency in a university program gets diluted in my opinion and some other aspects of the residency program might make an otherwise "inferior" (in terms of reputation/academic pedigree that's it) more desirable.
As for the FMG/IMG part... Florida, in particular, the areas near the big cities, are very diverse with a lot of Hispanic population and immigrants. This also means it attracts residents that already live in the area (which are more likely to be immigrants themselves) and leadership (such as program directors and coordinators) which in turn are also immigrants themselves. During my interview days, I noticed that many, if not most of the hospitals near large metropolitan areas had more IMG/FMGs. Also noticed that when the PD was Indian, more Indians residents were selected, when the PD was Cuban, more Hispanics and when the PD was middle eastern more middle eastern were selected. Many things might be playing into this. Some residents that graduated in the US and only speak English might rank a program in Miami where 40% speak pure Spanish lower simply because they don't want to deal with it and program directors might rank slightly higher those residents that are more culturally similar to him/her or even the patient's population (this is likely mostly subconscious, don't go screaming FRAUD! just yet).
