Eastman has a more conservative "straight ahead" approach to jazz, with an equal emphasis on classical (so your son also performed exceptionally well on the classical part of his audition). For students who are looking for more avant garde, "cutting edge" play, Eastman is not the place. I think of the two, Purchase would definitely fit the bill for "edgier" play, plus John Riley, from MSM, teaches there, and he is a fantastic teacher. Rich and Harold are also great, but very different stylistically. For my son, the style differences were huge, and would make this decision easy. But we know great jazz musicians who prefer playing standards and such, have chosen Eastman and done extremely well. Your son has two fabulous choices. Best of luck to him as he decides (didn't he have to make a decision by May 1, or are these waiting list admits?).