I'll just add that you'll be anywhere from 5-10 minutes closer to Epcot, depending on room location and how fast you walk, at BC vs. YC. Some people prefer to be further away, but as my name suggests, BC is my preference
I'll also say that my observation is that BC attracts more families with kids and YC attracts fewer, if that matters to you. I dream of a more serene YC stay, but the proximity to Epcot keeps me coming back to BC.