Tough choice. The rooms at AKL are smaller but we loved having the savannah view, love Victoria Falls, Jiko, Boma, the atmosphere and ambiance of the resort. Pool is nice too - very large. We don't find the bus service to be bad at all and it's nice that it only goes to Kidani and Jambo House and no other resorts.
OTOH, we love the BC. Rooms are bigger, walking distance to Epcot, S&D (for restaurants), close to HS. Never used the pool yet as it was always too cold (hoping to this December!). Nice atmosphere but not as lovely as AKL IMO.
I would suggest putting your priorities down on paper: room size, proximity to restaurants (what are your favourite ones?), proximity to parks (where are you going?), view. Then decide based on that but you can't go wrong either way. They're both lovely and both in our top 4 choices.