Another BCV owner here so that would be our preference, but I really don't think you can go wrong with any of them, except perhaps OKW if you don't have a car. We never have a car and rely exclusively on Disney transportation so we like having alternative options to certain parks.
When are you going? I assume that the resorts you named all have availability. I will add that based on a free market perspective (i.e., which resort has the higher resale value), it seems BCV is most popular, with VWL and BWV both running a close second.
The bus service to MK from VWL cannot be beat - we left the park near closing and were back in our room, yes our room not the resort, in 8 minutes. We had to wait for the bus for about 5 minutes so total transportation time was 13 minutes.
From BW and BCV, you can walk to Epcot or MGM or ride the boats - which are much faster than the boat from VWL to MK, for example.
You will have a great vacation though no matter which you choose. Since this is your first time, and if you are going during a busy season, you might want to invest in tour guide mike or the unofficial guide so that you can get the most out of your time at WDW. Life is about choices and the choices at WDW can be overwhelming, especially if you try to do everything. We took our first trip during the second anniversary of 9/11. Looking back, we made several "mistakes" that were easier to overcome due to the light crowds, but would have meant having to skip attractions or stand in 45-90 minute lines during the busier times.