Both are high in fraternity/sorority participation, but fraternity/sorority participation is higher at Dartmouth, if that matters to you.
Neither will have an intellectually diverse student body, since the minimum standards for admission are very high at both colleges. An intellectually diverse student body is more likely to be found at a state flagship with relatively low admission standards, but where the top students in the state, the barely college ready in the state, and everyone in between attend.