Yep, I know - I was raised in Chicago (born across the street in Oak Park) and lived there until my mid-30's. While I like Uno and Due, Gulliver's is my all-time favorite pan pizza. Giordano's is my favorite stuffed pizza and Calo and Rosati's are tied for conventional pizza. Now that I live in Phoenix (where all the expat Chicagoans end up) we have several Rosati's, Lou Malnati's, and even a Giordano's.
Side note: Most Rosati's are franchised, yet the pizza always comes out the same way - very good. And the service is consistently indifferent. They must have a strong training program for franchisees.