Reasons: 1. Reputation. Reputations of the three universities are comparable. Yes, in business school ranking, Cornell is less competitive, but remember that Cornell is ranked much higher than Ross and comparable to Duke in the university ranking. Moreover, Cornell is an ivy university, which is very well known in China. Do you want to come back? If so, forget Michigan.
2. Location. Cornell is close to New York. You can imagine what you can benefit from that.
3. Background & Alumni. Duke is well known for its general management, while Ross is renowned for consulting, marketing... Speaking of finance, Cornell is your best choice for sure. A network with a large amount of alumni specialized in finance can definitely put you at advantage when you seek a job in the areas.
4. Scholarship. Though it is not the most important, it deserves your full consideration since it can relieve your pressure and help you focus on study and internship. Should you be rich, forget it. Otherwise, put it in your mind.