Tucson and Phoenix have excellent medical facilities. Royalty travels to Phoenix for the help that Barrow Neurological provides. I was born and raised in Arizona. I say go for it and head to true blue Tucson. Maricopa was the fastest growing county in the nation at one time. Moving to Tucson you know that are helping it to stay blue.
My only complaint with folks moving from other areas to Arizona is that my beautiful state gets trashed. Not only with litter but with stupid comments about people actually being allowed to have horses on their property. Don't like horses than do not buy in an area designed for horses. Sorry, I need to get off my soap box on that issue. In Scottsdale back in the 50's and 60's had the motto "Horses get the right of way in Scottsdale."
Arizona was once the place people with health issues were told to move to if a dry climate is what they needed to improve their health. Since you have already lived in to areas you undoubtedly know that. Welcome if you do decide to come back.