We snowbird in AZ, we're retired and older, and we chose a town where we knew people who lived there already - friends and family by marriage. When you are older, having people nearby that you know is really a good thing. We live in a mobile home park, lots of activities, lots of interaction, very low maintenance.
I would chose one of the places where there are people you know. I don't know about the weather during the summer in Tampa but I assume it's humid. In AZ it's not humid but it gets really really hot. If you don't mind running your errands late at night or early in the morning and staying in during the day for a couple months, than AZ might be a good choice.