If you are comfortable with them going off by themselves, then I would recommend SSR. I like the idea of my boys having the freedom to move around WDW independently when they are older. There are busses and boats and trains and paths.
SSR is close to DTD and the Waterparks and the busses to the parks are direct. DTD is like a mall to young people with movies, restaurants, Virgin MegaStore and Disney Quest. There is also the boat to DTD OKW and POR.
SSR also has a Community Hall, Basketball and Tennis Courts and Bike Rentals.
Pool Table in the Turf Club, also several swimming pools (including the main pool) that are well lit at night. We love SAB at BC, but it closes early alot and the quiet pool lights go out by 11 pm so rarely are we able to take midnight swims. SSR built the CP quiet pool away from guest rooms and those guest rooms are sound proofed to buffer noise from DTD, so a dip in the pool at midnight doesnt disturb guests. I havent stayed in the other areas yet, Congress Park is our favorite.
Typhoon Lagoon is across the street from DTD so again lots to do in the neighborhood.