Another vote for the BCV for both the location and the pool. Although I have never stayed at the BWV, I think they would be great also. BUT, plan your request - at the time of booking - carefully. Some of these units are LONG walks from the elevators.
Also, on a different note, I would advise a 1 bedroom vs. a Studio for your family. The extra room will make all the difference in the world to your vacation! Do you plan on cooking much? If so, be sure to do some grocery shopping before you arrive on property. Disney will store (even perishables) for you until your Villa is available! Even if you don't plan on cooking meals, the full kitchen allows you to have all the cold drinks and snacks you desire, readily available - a great plus!!! One last thought, since any Villa larger than a studio includes a washer and dryer - you can pack less "stuff" (If you can!) Again a great plus! We have stayed at the BCV twice, both in a 1 bedroom - but once just my DH and I and the second time with DS (27 y.o.). Any questions - just ask. Bottom line - enjoy your trip