It depends on what you value in accomodations.
For unit size, OKW cant be beat. The rooms are the largest. The resort is also very quiet and a great place to take a break from your vacation.
If you have older kids and location is im portant, I say go for the BWV. The boardwalk has alot of fun for teens, when you dont want them to go far.
If you are big time swimmers, then BCV has the best family rated pool in all of WDW. It, like BWV is within walking distance to Epcot and a short boat ride toMGM.
If youre spending alot of time at MK, then the WLV are great. You also have the amenities and fun of the WL, right there.
If you want to be where everything is the most shiney and new, then SSR is the place to be. Its also very close to DD.
All the resorts are great. Its hard to go wrong.