I'm on the wait list at both, so this is a win win for me. I work at Wash U School of Medicine in the Division of Oncology.
In general, Wash U goes 9-5, and is lecture based. There is more class time here than average, but then I would guess a lot of people don't go to a lot of lectures. The amount of money on this campus is staggering. Any research you want to do is probably doable.
Case seems to be one of the best implementations of PBL. Less class time, but you need to be at all of it, and you had better be prepared and awake. The location isn't as good, but the people seem very happy, and not overly stressed. Can also use the extra time outside of class to get another degree, like bioethics, or physiology.
Good luck, and when you withdraw from one, send them my way.