Since you really love near park resorts (BWV and VGF), I'd buy where you want to stay. If you were thinking of buying 150 points (and in my opinion, that's the minimum to truly take advantage of
DVC if you plan to come annually), then buy 75 points at each resort.
Using the banking and borrowing option, you can book up to 3 yrs of points for one trip. More importantly, you can alternate two resorts that way.
For example, buy 75 points at each resort and :
2016: use BWV points and borrow 2017 points: 150 BWV points to use. Bank 2016 VGF points.
2017: Use banked 2016 VGF points and 2017 points: 150 points for VGF.
2018: Use 2018 and 2019 BWV points, bank 2018 VGF points.
Etc. For the few hundred dollars cost of a separate closing fee, you could own both. Buy where you both want to stay.