Having only stayed at AKL of the 2, I can say we were VERY impressed. Yes, it's not close to MK, but really, the drive is not bad, and the bus, from what I understand, is great and is exclusive to AKL. Being from MN, going from a northwoods theme here at home to WL hasn't appealed to me yet. As we bought into DVC, I imagine I will get to VWL sooner or later.
But the AKL theme is totally unique, having the animals outside our savannah view room was totally worth it. Boma is fantastic. The pool is perfect in its simplicity as the Oasis. And the hot tub and playground awesome to have available.
All I can say is that you will not regret a stay, of even a couple days, at AKL.
If you can't decide, maybe you should book both and do a split stay.