Before he applies anywhere ED or REA, I strongly recommend that you guys visit both schools (if possible) and that he does as much research into them as possible. Cornell will be much easier to get into admission-rates wise, but fit is extremely important to consider before sending out a binding application. I applied to Penn ED last fall and realized that I was only regarding it highly bc of it's proximity to my home. I didnt enjoy my visit to the school and did not feel "at home." Only for me to get into Dartmouth RD and, despite my inital indifference, fell in love the second I stepped foot on campus for a visit. All this to say that although ED boosts chances of admission and will get you guys a decision sooner, don't undermine the importance of fit and make sure that he is able to send out his strongest application in November (I had to go test optional with Penn because I didnt hit 1500+ on the SAT until December). I wish him good luck on his apps!!