I think it really comes down to theme. We've stayed at both, and they are layed out very similar. My kids prefer CBR. We've never requested a specific building and we've always been satisfied. If you aren't near the food court, then you are close to a bus stop--even better! Only time we were disappointed is when we went with another family, booked way in advance to be together, and when we got there, the only rooms together were smoking. (That was four years ago--not sure if they have smoking rooms anymore)
CBR has a tropical, island feel and CSR has a Mexican feel. The grounds at CBR are so nice--never minded the walk to the main building for b'fast or a late night snack.