Sorry it's taken me so long to get back on here (and hence, to reply)...I work a lot.
Not dodging your question (not really the dodging type), just didn't get around to reading it until now.
I'm sure if you're at the point of tossing around the Dukes v. Michigans, you're a relatively good catch. So I hope you end up at the place that puts your potential to greatest use.
In my opinion (others might disagree publicly), cameraderie is lacking within Duke general surgery; training at Duke can thus be quite an isolating experience. Otherwise, it's quite a traditional program (exceptionally so for it's youth); as such, operating is something that comes with experience (rather than operating as a young buck to gain said experience). That the surgery department at Duke is the only department that mandates its first and second year residents to wear short coats as the medical and PA students do, as well as white pants, is telling; It speaks to an air of extreme hierarchy. Etc, etc....
At the end of the day, you're going to become a great general surgery if that's what you work hard to become, whether you train at Duke, at Michigan, or at (insert renowned pedigree here). The next 7 years of your life are kind of a big deal, so take the advice of everyone you encounter (though you may not realize the gravity of the advice at this early stage) and try to Match at the place that's the best fit for you (I fully realize the inherent difficulty given the "Match" process).