All of them!LOL I have boys 10 & 12 and they would tell you that they like them all! We visited all of them at some point on our last vacation (before we purchased) and there were good points at each. BCV has the pool that is a waterpark, BWV has the Clown Pool and Boardwalk area, SSR has DTD and a cool pool too, OKW is tropical and laid back, and VWL has the boat to MK, the lodge and scenery, and the trail to Fort Wilderness.
BWV, SSR, and OKW have the Community Hall with games, activities, etc..., all have a game room I believe, and all of these features at the
DVC are in addition to the thrill of Epcot, MK, SK, and MGM!
Have fun-you really can't go wrong, no matter what you choose. We have BCV planned for Feb., and then SSR & BWV for August. VWL really appeals to me for the Fall/winter, but it may be hard to book at those times.