I think there are more activities for both young and the older folks at BWV.
If your kids like ping pong, foosball, air hockey and video games they can all be accessed for no additional fee at BWV's community Hall. And while SAB at BCV is certainly popular, the keister coaster pool at BWV is tons of fun too. (In fact some who don't l ike the feel of sand in a pool prefer the BWV pool).
Also, the boardwalk itself is a great place to hang out. Whether you're in the mood for strolling or eating, or partying, there's so much to do and see. The boardwalk has a variety of restaurants AND a sweet shop (ice cream and candy) as well as a terrific Bakery. Or if you want to go to a Piano Bar or dance hall (adults only) the boardwalk has both within steps from your room. Admittedly it's a close walk from BCV to the BW (about 5 minutes), but having it all right there is especially convenient.
There CAN be a somewhat long walk from the elevator to your room, but I've been as far as can be from the elevator and it isn't terrible at all. In fact I kind of like it, less traffic walking past my room! But if the older folks in your party have mobility problems and you DO choose BWV, request a room closer to the elevator. There's no guarantee of course, but if you don't have a lot of other requests there's a good chance you'll get what you ask for. And although people joke about being able to reach the fridge from the balcony I've never found the BWV to be small at all, 4 adults will be more than comfortable IMO.
Lastly (and I hope I don't get flamed for saying this), if you read historical threads on these boards there generally seems to be a better level of customer service at BWV.