Congrats! I was a USC undergrad and applied to both schools. Coincidentally, I also withdrew my applications from both (more interested in other schools) but know students/alumni from both and can give you some insight. Ranking doesn't really matter between the two of them since they're both effectively top 10 (I could go on about rankings but will save you the spiel).
USC: Extremely expensive and your experience there will be very reliant on whichever social circle (re:fraternity) that you join. It generally promotes community pharmacy over residency but of the students that apply for residency, ~75% match (including amazing residencies like Stanford & UCLA). You should understand that CA is EXTREMELY saturated. USC has some of the best connections for finding a job in SoCal (UCSF dominates Bay Area), but you're also just as likely to not find a job in CA. USC's connections will give you a slight edge but that edge could easily be made up by other things, such as landing a good residency (or fellowship if you've looked at that route).
UF: You mentioned you haven't visited Gainesville. Gainesville is a small town in middle of nowhere FL and I cannot emphasize enough what a change of pace it will be for you coming from a school next to DTLA. However, it is much cheaper (esp if you apply to be a FL resident after your first year to get public school tuition rate). It does boast the highest residency match numbers (I couldn't find the match rate percent, so the high numbers could just be correlated to the fact they have a high class size). It strongly promotes residency, but most students will match within FL.
TL;DR if you want a residency and don't care about location for school or residency, then UF is an easy choice. If you want a career in CA in the long run and willing to deal with the high tuition and social cliques of USC, then USC will give you some edge in CA positions & residencies (but you should be aware of the extreme competition in CA and the edge will not be a make or break in your career). Feel free to DM me if you have any questions!