Got admitted to both.
Wich one is the best?

UPenn according to US NEWS

But is there something besides USNews? Say, they publish a new ranking and Duke goes up 3 places and Upenn goes down for two or three are they equal then? Nope. So? Everybody knows HYPe, what about UPenn and Duke?

I urge you to come to Duke. I am here now and I think that the program is perfect. At the time, I had offers from Duke and Penn (and other three universities), chose Duke and I think that it was a great decision. The stuff here is as helpful as it can get, the size of the program is just right (about 80 students), cost of living is lower and employer think of us very well - I have only just got a very good job offer and many more callback interviews; my friends here have done just as well as I have. Feel free to get in touch to as questions and discuss (my email is tomer.schwartz@law.duke.edu). Good luck!