I have stayed at the YC 3 times, and have yet to stay at the BC, and that is because I prefer the YC over the BC in all areas.
The theming for onr, I love the nautical elegant theme of the YC. The woodwork, shiny brass, model ships, everything about it says this is one classy resort!
The casual beach theme of the Beach club is carried out beautifully as well, however it is more casual, seems to be louder too. A lot of people feel more comfortable with that, but I prefer the quiet elegance of the YC!
the service is impeccable at the YC, and being that they share a staff, I would assume that the service at the BC is the same.
so basically it comes down to theme preference!
the proximity to Epcot is not an issue. the BC is only a few steps closer, not enough of a big deal to make it be a decision maker, that's for sure!
both are amazingly wonderful resorts! also the YC has full balconies in every room. that could be important!
have a wonderful trip to WDW!!!
Laura