UNC Kenan flagler, a school that is about 20 mins from Duke University draws a lot of advantages with that aspect.
As for operations management, I believe that you applied to the universities looking at what they have to offer I believe.
Check out the Alumni percentage and number who are currently pursuing the same path, look at post-MBA growth trajectory, Region on the employment, employers visit on campus, networking options and locations for your research.
There's no expert in this area, hence, you truly need to build a relationship with the Alums and Current students to truly find out what is going on in that area.