But you said that your son is tight lipped about his preference. He's been identified as one of the best of the best. If he's like my boys, he's probably smarter than his parents anyway.
Your very question leads me to believe (and please forgive me if I'm wrong) that you are extremely involved in this process. It MUST be his decision. If you steer him one way or the other and it doesn't work out you will regret not letting him chart his own course.
For my own sons, the end result (career) was the deciding factor.
It is hard to step back and let them make their own way.
Good luck to you and him. He is in for a fantastic experience whichever way he goes.