Well, BCV gets Stormalong Bay, which is nearly a water park so is considered by some to be the best pool at a
DVC resort. I've never stayed there so can't speak to that experience, but I love the slide at the BWV Luna Park pool! And both BCV and BWV are right there walking distance to all the restaurants on the Boardwalk and at Yacht Club, Beach Club, Swan, Dolphin, and Swan Reserve, not to mention a short Skyliner ride from Topolino's at Riviera. I'd also consider Riviera itself, for the convenience of the pool bar and QS restaurant to the pool, but I don't know how the pool slide is. Oh, just realized you might mean lounging by the pool instead of enjoying the slide - well, Riviera's second pool is also pretty near to the bar and QS! And finally, I'd say that your home SSR is pretty great too, with four pools, two of which have slides and pool bars/QS, and you can just hop a bus to move from one to another when you get bored.