It shocks me that all Chicago is known for outside of Chicago is "Chicago Style" / Deep Dish pizza. The only time Chicagoans grab a deep dish is when their relatives from South Carolina are in town. The Chicago style pizza that locals eat everyday is a thin crust (pronounced tin), cooked to almost crispy, topped in what most call a supreme and cut into squares. Some call it Tavern Style around the country. The act of buying a pizza is called Scoring a Pie or Scoring a Wheel with some.
Lou's has great thin crust, so does Aurelio's, Papa Pasero's, Home Run Inn and a thousand other local joints.
Gino's East, Pizzeria Uno and Due are quality places but are tourist traps. They specialize in DD's and I have no problem eating a peice or two when I'm there with guests but I'd never think to order a DD over a pizza on a normal day.
Giordano's can be just as good as Lou's if it's owned by the right people. I know some that are sold to people who don't know the 1st thing about building a pie. It's like going to Panda Express for authentic Chinese.
Can't believe a Chicago guy didn't pipe up earlier.
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