We own at both.
If you've got small kids that like the pool, I'd go with BCV for access to SAB. If you've got older kids that will soon enjoy the nightlife (and the slide at Luna Park), I'd go with BWV.
If you don't have any kids to worry about, I'd make the choice on "activity level." The nightlife is better at BWV, but BCV is usually calm and serene.
BWV is more "central" to Epcot and MGM, but BCV is, IMO, closer to Epcot.
I know what I like, but I'm not usually swayed by decor, at least inside the room. They seem about the same to me.
The shower area at BCV has more doors than the shower area at BWV.
There's a "Community House" (my words, probably not the right title) at BWV for owners to play games, get movies, etc. that doesn't exist at BCV.
Parking is much closer at BCV, no need for valet. At BWV, we always use valet just because it's a hike to the parking lot.
I love them both and feel priviliged to have the option to stay at either one. Whatever you decide, you'll be happy.