If you stay at the CR, you'll be waiting for a monorail after the fireworks at Epcot. And believe me, that's not so much fun. At BC, you will find they share with YC, all the time. And they can share with BW/S/D at certain times. I stay mostly at BWV..and have yet to find the buses to be awful at the Epcot resorts. But then again, I do enjoy the ability to walk to two different parks vs just the one at CR/BLT (where I also own).