I think this has got to be the right answer. I recall seeing a cooking show on TV a year or so ago, in which firefighters in New York and Chicago were given head-to-head taste tests of one anothers' pizza. Not surprisingly, the New York firefighters preferred New York pizza while the Chicagoans preferred Chicago. Ulitmately, a control group of firefighters from L.A. (I think), were brought in, and they cast their lot with New York.
As for me, I liked Chicago pizza long before I moved to Chicago. Pizzaria Uno was available as a chain in Connecticut when I was in college, and I was able to order it when I lived in Boston as well. It was vastly preferable, to my pallate to the other options available.
Now that I actually live here though, I have to admit to having become a bit jaded. As a special treat, I'll still take a Chicago deep dish any day, but when we order as a family, we've got to go for the thin crust (which, if nothing else, is better for my arteries!).
That said, if I had to choose, in the city of Chicago, I say the best pizza is Pequod's on N. Clybourne. It's got a nice crispy crust.