I posed this question this spring - I think you can click on my name to see questions I posted and then look at the replies. There is some way!
We have stayed twice at BOTH AKL and WL and enjoyed both and would recommend both without hesitation. With that in mind, our next trip is back to the WL. For being themed differently, they are amazingly similar. WL wins for us because it is closer to the MK, and we like the water options: boat launch and electric water parade. I do want to point out, however, that we never had to wait long for buses at AKL. It also has its own bus service. WL shared with Poly and GF, but I believe it may now share with Ft. Wilderness.
The animals are great to watch, but they aren't there 24/7; the waterfall, stream, and lake are always in the view at the WL. Again, one small difference.
The restaurants are much better at AKL, though. Our AKL visits involved visiting Bomas more than once, and it has become a tradition for us on our visits.
If you stay isn't a short one, you could always split your reservations between the two resorts to sample each. However you decide, you will enjoy!