I'm afraid I can't offer much help with your fortunate dilemma since I am in a similar position (CCLCM vs. Yale), but I will say that PBL is not how you spend the majority of your time at CCLCM (this was a misconception I had too until recently). Apparently you spend more time in seminars (basically small group interactive lectures with faculty). Not sure if that helps your decision-making, but best of luck to you!