You cannot beat the convenience of the BWV to MGM and Epcot. In fact that is probably the main reason that BWV is our resort of choice. BCV are almost as convenient but a little smaller, but the pool is the best. I do feel that transportation to the 4 theme parks might be a drawback to SSR although if you like Downtown Disney that would be a plus.
As far as 2-3 months out, what time of the year do you like to travel. If you are not going during the peak months, it may still be possible to get a room. Also, review the cancellation policy, perhaps you could book a room based on when you would ideally like to go, and then if that does not work out, cancel and rebook when you actually can go.