Agree that WashU and Chicago students are similar. OP can’t go wrong with applying to any of the schools. Perhaps the only difference is in the sports program since NW is D1 playing in a major sports conference (Big-10) and the other schools are D3.
One of my son’s friends at WashU is a UChicago double legacy (both parents) and went to high school at UChicago Lab and lived 20 minutes from Hyde Park. Why he opted for WashU nobody knows…