I also live in Florida, but for my Model S I opted for AWD, because:
1) I have had 3 or 4 sports cars that had AWD, and I loved it. I like how a car handles when all 4 wheels are pulling for you.
2) I have a real aversion to wheel spin, or the traction control killing power, when I pull out fast in the rain. I think my heart skips a beat or 2 everytime I go to pull out in the rain with incoming cars heading right at me, and the tires start spinning, the traction control kicks in, and I'm going nowhere. This NEVER happens in my 70D. I have deliberately launched it in every kind of weather, and it just GOES!
All that being said, I was planning on just getting a base RWD Model 3, but Elon's Tweets recently about the AWD option being <$5000 are making me reconsider.