I would caution against placing too much weight in random rumors and stories. Moreover, the true question to ask while interviewing at programs is which program is the best fit for YOU. If you take all the programs in the country and eliminate those that may not offer you the best training (however that is defined), then you should be left with programs that should all be considered. Think about the following questions (which are just a few of the many you could ask):
Is the program more academic or clinical/private practice?
How big is the program (# of residents, faculty, cases, hospitals, etc.)?
Where is the program?
What are the residents like there, and can you see yourself working with them, learning from them and...becoming like them?
What are the subspecialties that are well- and under-represented at the program?
Then see if those answers correlate well with your own preferences. A program like Northwestern may be more work-centered, but, at least from an objective standpoint, they have very well-known faculty and a strong case-load. Some people flourish in that type of situation.
In the interest of full disclosure, I am a mid-level resident at a different Chicago program.