This was the hardest decision for us - OKW or BWV. We love them both and there are pros and cons for each. Our home resort is BWV and my brother's is OKW (until they stayed with us at BWV - they now have BWV points too). This works out well for both of us, as we have someone to trade points with for getting ressies at the 11 mo. window.
We are 2 adults, no children, who prefer Epcot, MGM, and AK over the MK. The BWV location is perfect for us. However the OKW units are MUCH larger and if we were to go to WDW and not 'do' the parks, but just relax, we'd prefer staying at OKW. The kitchens of BWV are pretty small and so is the living room, it could get pretty claustrophobic if you had many people there for a lenght of time.
If you think that you would want to stay in a 'standard view' unit at BWV (these are about the same number of points/night as OKW), you need to be aware that they are almost impossible to get at the 7 month window. You'll need to buy at BWV if you want to stay in one of them very often.
Since we don't often (ever??) cook dinner at WDW, we like the variety of restaurants within walking distance of BWV.
We much prefer the studio arrangement of BWV - a queen bed and a sofa bed. This way we can actually sit on a couch to watch TV/read rather than trying to get comfortable on a bed. Even though the OKW studio is probably larger, we think the BWV studio seems more spacious because the floor space isn't taken up by another bed.
We also like that our packages are delivered to our room - rather than having to hike up to the gift shop at OKW. The furniture/decor at OKW is mighty nice, wouldn't mind having some of it in my house.
We worried that, no matter which resort we purchased, we would regret not having bought at the other resort. We've never regretted buying at BWV - but we're glad that my brother has OKW points
Good luck with your decision.
Enjoy!