I don't know about the best, but I find Washington Dulles interesting due to the confusing nature of it.
My wife (who doesn't fly to Chicago) believes that Midway is the best as I usually pick up popcorn for her from "nuts on Clark" when I travel.
My wife (who doesn't fly to Chicago) believes that Midway is the best as I usually pick up popcorn for her from "nuts on Clark" when I travel.