We had the exact same issue - started looking at OKW, ended up buying at BWV.
OKW you can buy a little cheaper and the maintenance is lower. The rooms are bigger.
BWV is, in my opinion, an awesome location because you can walk to 2 parks. Standard view is about the same points cost as OKW.
We chose BWV because we wanted to be able to take advantage of the standard view points levels and didn't think we could do that at the 7 month window. It did seem to be totally possible to get into OKW at 7 months though, so we didn't think the 11 month window was such an advantage there.
If you thought you'd use a lot of OKW GV's then having the booking window is great. Other than that, though, we thought you could usually get in there. And we don't mind if we don't always get where we bought - we like to see everything. We thought we'd use the SV at BWV a lot more. And since the first
DVC room we stayed in was at the BW, we thought it was huge anyway, so we know the room size will be adequate.
You just need to really evaluate how you are most likely to travel, and remember that it really might change over time.