Duke vs Cornell for math major

My son was accepted to Duke and Cornell and he would like to study mathematics. Can you help with clarifying the strength of each of the above colleges Math programs? Any advice? He was waitlisted for UChicage, Princeton , CMU and Upenn, but we have to work with what we got right now. Any advice would be greatly appreciated. My first time doing this.

Duke!

IfnousWHO - can you elaborate why ? :slight_smile: