If I stay at a monorail resort it's because I'm doing more MK days or a lot of resort days.
If I stay in the Epcot area, it's because I'm going to be in Epcot most of the time.
For me, it's a tough call between BC and YC. BC has a busier lobby with the Cape May character breakfast people in there all morning. And 50% of the rooms don't have full balconies, just little standing ones. But I do like the decor and it definitely gets a +1 in that the BC Marketplace has CS food and a mug refill station that makes it convenient.
YC is very dark but it's quieter and the rooms have full balconies. The bar, Crew Cup Lounge, is very convenient also.