If most of your time is going to be spent at MK, then VWL would be the most convienent. Overall, I think that each resort has its transportation pros and cons. Here is my opinion:
VWL:
Pros: either bus or boat to MK, boat to Contemporary
Cons: Shares buses with other resorts (mostly FW)
BCV & BWV:
Pros: Walking distance to EPCOT and HS. Also boat available if you don't want to walk.
Cons: For MK & AK, shares buses with other resorts
SSR:
Pros: Can walk, take a bus or take boat to DTD
Cons: Large resort so if your stop is one of the last ones, you could be standing
OKW:
Pros: Can take bus or boat to DTD
Cons: Large resort so if your stop is one of the last ones, you could be standing
AKV:
Pros: Doesn't share buses with any other resort
Cons: Must take buses to all parks. Some people feel that it is out of the way (not me).