You will probably be OK with either, but as far as just room goes, OKW is better. The 2BR is 1410 sq ft compared to BWV's 1071 (a huge difference). The OKW second bedroom has two beds while BWV has a bed, a smaller than twin-size Murphy bed that pulls down from the cabinet below the TV, and a pull-out couch (although that might be preferred if your parents are taking the second bedroom). The living room at OKW has both the pull-out couch and a twin-size pull-out chair. The OKW balconies are generally larger than BWV. And an OKW room is significantly points-cheaper than BWV (except for BWV standard view which can be very difficult to get even at 11-months out).
Nevertheless, if there is any thought to others, I personally consider the Kidani (1173 sq ft) and BLT (1152 sq ft) 2BRs to be the best 2BRs. You can choose dedicated or lock-off. The dedicated have two beds in the second bedroom while the lock-offs have the bed and pull-out couch. Both have that extra twin-sized pull-out chair in the living room. BLT 2BRs have almost floor to ceiling windows in the living room for excellent viewing. And most important, both have three bathrooms, something that is absent from every other
DVC 2BR.