I have stayed at BWI and now own at BWV. I can safely say that there is no difference in accomodations.
While at BWV you still have access to all the amenities of the BW Resort. Plus as tjkraz mentioned in a one-bedroom unit or larger there is a full kitchen and washer/dryer. Plus the addition of a whirlpool tub.
Let us know what your experience is after you are back from your trip.