I'll give my standard comment for people doing Home resort research. By the time most DVC contracts expire, your DS8 will be your DS50.

DVC is a long-term commitment. While I don't fault you for asking, I wouldn't make something as superficial as a pool slide a big part of your decision. You gotta look at the entire package and (attempt to) select a resort that holds the most overall appeal--preferrably just to you and your significant other since the kids will be out of the equation loooooooong before your owneship ends.
Good luck!