Eh, I've lived in the tropics before and I've lived years in AZ so I've done it all. Granted, I was a LOT younger then so maybe humidity will hit me different now.
I think it largely comes down to which coast (FL is closer to my girls) and how close I want to be to family. My parents and sister gave me the hard sell when I was out there. I love AZ, didn't even want to leave. It looks like cost of living is cheaper in FL at the moment, especially buy and rent-wise.
Honestly, it's getting over leaving my children and doing something else. They've been my reason for existence for decades so I have to figure my life out now. My family apparently WANTS me in AZ and that means a lot. I also need to figure out how much I want to be close to the beach. I might be romanticizing how much I love the ocean. I'm driving down to FL at the end of the month and spending about 3 weeks just poking around to see what I think.