Hey Willie, tell us how you really feel....
Chicago has both stuffed pizza and deep-dish pizza. No, they are not the same. To me, stuffed is the suburban thing, and deep-dish is the city thing.
For stuffed pizza, I like Carmen's in Evanston the best. Nancy's (a local chain with many locations) is second. Giordano's is good enough but I agree with Willie's comments on an earlier page about their sauce.
For deep-dish pizza, it's Due during an off-peak time (we've had really good luck at FT gatherings going at 11:45am on a weekday). Malnatti's if I have to. I am not a fan of Geno's, and have had only bad experiences at Connie's and Aurelio's.
For thin-crust pizza, my favorite is Two Brothers From Italy in Elmhurst. When I lived in Elmhurst, I rarely ate stuffed or deep-dish as Two Brothers' thin crust was excellent.