There are some differences if you book through Disney's CRO and through a DVC point rental place. If you book through CRO, you'll be a hotel guest. If you rent with points (through a DVC point place), you'll be a DVC guest. The biggest difference is that hotel guests get daily house cleaning (towels, shampoo/soups, beds made, room cleaned, etc.). DVC guests do not get daily house cleaning (I think towel service happens on the 4th day and a full cleaning on the 7th, but I don't remember the days for sure).
The BC is a pretty small DVC, so they sell out relatively quickly. If you know you want to stay there, make the reservation as early as possible. Note that because of the relatively small size, there often aren't very many room included in any discount promotion. If you can't get BCV, then BWV are a pretty good option. The rooms are fairly similar to BC, just different coloring.