That's tough. I'm generally not in the business of saying "This school is better than that one." Based on what you said about your intended concentrations, I maybe would have recommended Duke. But, given your comments on hands-on learning, I might recommend Cornell instead!
It might come down to geography. Both are very strong schools, but they tend to be a little more regional in focus and reputation. If you want to work in the northeast instead of the southeast, that might give Cornell the edge over Duke (and vice versa).
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