I own at both
I prefer the pool at BC, DS (17) prefers the pool at BW, and DH could care less, they both have a bar.
As far as nightlife, the BW is right there even if you're at the BC, so I wouldn't let that make up your mind.
I prefer the rooms at the BWV. They are a smidge larger (about 40 square feet in a 1BR), not all of the bedrooms have a balcony and slider at the BCV

That was a real bummer when we stayed there with DH's sister...I like to go out onto the balcony when I wake up to see what the temp is, and couldn't because I didn't want to wake her. Also, the balcony we did have off the LR was positively microscopic
DS prefers the BWV because it has Community Hall, and he almost always meets other kids there to play video games and such for an hour or two each day.
The BCV are newer and a bit closer to Epcot, although the BWV are that much closer to MGM.
Frankly that time of the year I do'nt know if you'll have much choice--where is their contract (their points)? You'll wnat to book at the 11 month point, and will ahve to wait until the 7 month point if it's not their home resort...in which case it'll probably be booked up already.
Anne