I agree, the condition itself and the mileage would be my two big factors. I've lived in both climates and in Michigan, I usually had rust starting somewhere within 3 years of buying a new car (and this was with frequent washes). In the south, you don't get rust but you get a lot of dry rot, it's tougher on exposed rubber surfaces. Furthermore, the lack of a good wax job can cause oxidation or worse to the paint. (you'll see a lot of neglected Florida cars rust from the top down). If everything (condition, mileage) was a draw, I would personally prefer the Florida car.