I have stayed at both the WL and AKL and definitely preferred the AKL. I found the WL too dark. I guess it just goes to show you that everyone will experience a resort differently, eh?!
You can't go wrong with either resort. The same gentleman designed both of them. He supposedly got more freedom with the AKL and got to do all the things that he didn't get to do with the WL, or so the rumor mill goes. You just need to decide what type of vacation experience you want, and then choose your resort accordingly. If the price difference isn't too much, and it sounds like it isn't, then leave pricing out of the equation and work from there. If you are going to hang out mostly at the Magic Kingdom, then maybe the WL is the resort for you. However, if you are going to bop all over the World, then where you stay doesnt really matter as both resorts are kind of removed from everything. They are both deluxe resorts, but they will each offer you something different. The AKL is the most unique as you have your own zoo, so to speak, at your fingertips (okay, not your fingertips since you cant touch the animals, but you catch my drift). Have fun choosing and enjoy your vacation.