The family (husbands side) has been eating Happy Joe's pizza since they were living back in Iowa/Illinois back in the 70s. I can tell you one thing, when Happy Joe's came to AZ, the family was seriously excited and kept raving about something called "Taco Pizza". I had it one time and though, ok this is pretty good!
I decided to order Happy Joe's Pizza for pickup on New Years Eve to bring as our "dish to pass" to my sister in laws NYE party. All original crust, I ordered 2 Little Joe's - 1 chorizo taco, 1 matador. 1 medium nacho joe. 1 large taco joe. The family of course tore through the taco joe. Which is good and the traditional taco pizza. I really liked the others as well. I think my favorite was the chorizo taco.
I've tried the taco pizza at the pub down the street from the house, and it really couldn't hold a candle to Happy Joe's. I just wish the had a location closer to phoenix.