Good morning, @Emily Lopez! If you like living inches from the face of the sun, Phoenix is the place - it's a dry heat. :) I'm a mortgage guy, so you can decide how that informs my opinion.
On the realtor side of things, everybody and their dog and their dog's uncle is a realtor here. While that would seem to be a negative, it's actually a positive - let me explain. Because of this overabundance of realtors here, there's almost a preconceived notion that ALL realtors are lazy - that they sit around eating bon bons after listing the house on MLS - and this plays in good and great realtors' favor all the time. In other words, if you're good at what you do as a realtor, you will REALLY stand out and do VERY well as an agent. With your experience as a realtor, contractor, and investor - regardless of where you gained and cultivated that experience - this will give you instant credibility with most clients. Sure, you'll have some who will initially look down their nose at you, but once you start talking to them and they see you know your stuff, that will change quickly.
As you probably know (this is sort of like me telling you the sky is blue), there's a serious shortage of homes (both for purchase and rental) here in Arizona. That presents you with some challenges as both a flipper and a landlord, but my experience in the REI world is that those who are able to find and rehab the properties that cash flow are doing very well and have no trouble finding long-term tenants.
I wish you all the best and hope this was helpful. If, while you're in town, you'd like to meet for coffee to discuss further, I'm open.