I love pizza. Almost all pizza. When I moved back to the south hills of Pittsburgh (having been spoiled by the quality and variety of food in Las Vegas), I tried several different pizzas. Pizza Al's quickly became my favorite. Minimum of once a week.
Their pizza is a thin crust, almost NY style, with a sweet and tangy sauce that doesn't overpower the flavor. They use the small pepperoni that is flavorful, again without overpowering, and the cheese is the perfect blend of just a bit gooey, and slightly chewy.
Make sure you're hungry if you order a large as it is HUGE. Great food, great staff, great prices.