I'm sure everyone loves their own home resort best (which is why that's what they bought into)......we chose BWV, but here are a few thoughts on pros/cons of some of the resorts:
VWL--closest to MK; good access to bike paths, etc
BCV --walking distance to EPCOT and longer walk to MGM; awesome pool, but IMO, pool is very difficult to deal with with young children.....it wraps all around and is very spread out.....when they are very young, of course you have to be within an arm's length at all times anyway but when they get a little older and they're at the stage where they can swim but you still want to keep a close eye on them, the BCV pool can be quite a challenge; of course, when they are even older and self-sufficient, they may consider BCV's to have the best pool they've ever seen
BWV -- nice themed pool; separate baby/toddler pool; small playground; Community Hall offering *free!* video games, toys, crafts, ping pong, foosball, etc.; right on the Boardwalk where there is more *free* entertainment wandering around every night; can walk or take boat ride to both EPCOT and MGM
SSR -- Downtown Disney area; I don't personally know much about it, but I hear they have a "zero entry" pool.....that'd be great for young kids
Old Key West -- Larger rooms plus the ability to park right by your unit making loading/unloading and quick trips out to the store or restaurants very convenient
I'm probably forgetting some, but that should get us started.....
No matter what you decide,
DVC is great!