You're going to hate this answer, but it doesn't matter what WE think... It matters what YOU think and what YOU want to do!
When I thinkof Chicago I think strong in analytics, when I think of Darden I think of strong adherence to the case study method, and when I think of Yale I think of general management and non-profit programs.
But don't take my word for it... If you are lucky enough to have a choice between those schools, visit them adn decide for yourself. At the end of the day, visiting and seeing how each school "fits" is the most valuable thing you can do.
Scott
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Co-Author, Your MBA Game Plan