OP where do you want to work? If you go to either school, you will be in that region for a long time. both are very expensive ( miami cost of living is almost as expensive, as NYC), and neither of them will get you back to wisconsin. I would suggest that you visit each area for a few days at least to see what its like, and which one suits you better. Im from NY, and it can snow every day for a month straight. Miami is nice, but have you been down there in August when its 90 degrees with 90 percent himidity? You literally sweat while drying off in the shower.( i spent some summers in miami visiting my uncle growing up). Its very intreguing, especially in january- february, but you need to see if its for you
Compared to many other cities, the COL in Miami is obviously very expensive. That being said, it is not quite as expensive as living in the city. I've lived in NYC and I live in Miami now. Going from Miami to NYC, I almost get depressed when I see apartments/studios in the city. For $500-$600 in Coral Gables (where the UM campus is), you can live in a gorgeous house or a really
great apartment (more realistic for a law student). And just within that price range, you have a multitude of options. For $800-$900 in Brickell, you can live in what basically amounts to a palace. At the same time, you cannot really get by in Miami without a car...so that changes things a bit. And COL includes much more than just rent, but I'll stop at that.
The heat and humidity can be pretty brutal. Still, like two days ago it was like 19 degrees in NY (if I recall correctly) and we were laying out by the pool. Today we went biking by the marina...in perfect weather. I guess you won't be doing much of this while you're in law school though.
Miami is awesome. But don't come here if you're going to miss all four seasons. OP, if you have any questions about Miami/Coral Gables feel free to PM me. I'm a 0L though, so can't help you with much else.