Hey Martin, I did the same thing a few years back - I'm from Seattle and moved to N Phoenix!
In my opinion, holding onto real estate is better than selling in most cases. If you're cash flowing on the home being rented, I would keep it rented and decide what you want to do with it later. Who knows, when you get down here you may be happy you have some extra income coming in.
I do think the gameplan depends on your strategy though. If you have a portfolio of rentals and want to keep this home as part of your portfolio, go for it and add to your cashflow. If you are wanting to take a big lump sum and put it into an awesome place in Scottsdale then I'd 1031 it.
I heard a podcast the other day with a host saying something along the lines of "there's 3 phases of investing: starting, scaling, and harvesting." Sounds like you're in the scale/harvesting time so I think you need to determine if this property is something you are happy with the cashflow it would produce as well as the time needed to manage it or hire a property manager, or is it time to take the equity and redeploy it into something more worthwhile like a higher cash flowing investment or creating higher equity in the home you buy down here.