If you are thinking of renting points, OKW will be less expensive if you compare the same size rooms. If you are able to secure a reservation for a standard view room at the BWV, there will not be a lot of difference between the two, but OKW will still be slightly less expensive. You can use the calculator (link at top of the DVC Forum) to determine the number of points required per room. It depends on the dates of your stay and the size room that you need. Your party could fit in a studio. The most often quoted price to rent is $10/point.
It can be difficult for renters to get a standard view room at the BWV. Those rooms generally book up during the first few weeks that reservations can be made. A renter would have to find an BWV owner who is willing to make the reservation as soon as the window opens. Some owners (not all) charge more per point to make a reservation at that time. If you rent, be sure to ask the owner about his/her cancellation policies and ask questions if you do not completely understand.
If you are planning to book through CRO and pay cash for the room, OKW is usually less expensive, but it really depends on availability and the discounts that may or may not be offered for each resort.
HTH.
