That's a tough question. Tough to decide between 2 weeks at AKL or WL. In my opinion, 3 weeks would just be too long. I would probably be ready to go home by 2 weeks (the longest we have stayed so far is 9 nights, with 10 planned for April). Not to mention that there may be problems getting that much time off work, and I would want to save some vacation time for later. And one more thing to keep in mind is that even though you say the price is the same, it isn't really. You're talking one whole extra week of paying for food and snacks every day, and souveniers, etc...which could add up to quite alot, even if you only eat counter service and snacks.
So for me, the choice is between the two 2 week options. On the one hand, I may be tempted to try AKL since I haven't stayed there yet and so staying somewhere new is somewhat appealing.
On the other hand, that particular theme has never appealed to us, and we enjoyed the Wilderness Lodge when we stayed there in April. And I like having Ft Wilderness just a boat ride away as well as the Magic Kingdom and the other resorts.
So probably 2 weeks at the Wilderness Lodge.