We love both for these reasons:
BWVs: great views of Epcot fireworks when staying in boardwalk view room, and on 3rd or higher floor
Community Hall has activities, 3 nintendo game consoles, ping-pong table, foosball tables for 9 & 11 year olds to hang out in. It's also by the
DVC pool.
Luna pool has a cool roller coaster slide, and is small enough to see your children from your lounge chair!
Small arcade room by weight room and Luna Pool
Boat to MGM, or walk or boat to Epcot
many food places to choose from on the Boardwalk: ESPN club, Spoodles, Big Rivier Grille, walk-up Pizza window, bakery close to Swan and Dolphin restaurants, Epcot & across the bay from Beaches & Cream at the BCVs.
Nice valet & bellmen...
request being near the elevators if you don't like a long walk to your room.
BCVs: smaller number of villas, can get close to self-parking lot for easy access to car
some good views of Epcot's fireworks
nice DVC pool and Storm a long Bay Pool with nice walk-up window for food Hurricane Hannahs
Beaches & Cream, Cape May, and deli in Market Place lobby area
short walk to Epcot
arcade game room next to Beaches and Cream