We have points at both VWL and now at BWV, but the lion's share is at VWL.
We love VWL, the theming is amazing, plus there are tons of other activities that people surprisingly don't refer to too often, among our favorites are, renting boats and going out on the lake and over the water bridge. It's fantastic to boat around CR, Poly and GF. We also love to rent bicycles and take the path through the woods over FW for lunch and of course a visit to the petting zoo. Love the boat over to CR for dinner at Chef Mickey's and over to FW for the campfire.
Then we have BWV, because we wanted something in the Epcot neighborhood. We enjoy being able to walk to Epcot and the short boat ride to MGM.
When we first bought resale, we obviously did not know that we would be adding on, so we went with our first love, VWL, because we had stayed so frequently at WL and because at 137 rooms, it is the smallest of the resorts. That was and still is minds a wise choice for us.
We have stayed at BCV and well, we weren't all that wowed by it. Not a least by the view we had from our balcony. It was nice enough resort and all that, but not really, well moving. SAB was attractive, but again not a real major point for us.
Would we have added on there? Not sure. I suppose so if it had been easier, we might have considered it. We ourselves preferred BWV, more for the theme, and the ability to get lower point standard view rooms.
If I had to pick just one resort? It would still be VWL, we love everything about it, but keep in mind that tastes are a very personal thing. What we love, the next person may hate.
Good luck with deciding. I was in the very same spot, 13 months ago.