We have!!!
Last November, we spent a night in a savanna room at AKL the Friday after Thanksgiving. Then we moved over to the VWL. Both were wonderful (although I have to say I am biased to WL). Similar basic architechtural design? Sure. The lobbies are both cavernous and awe inspiring. Same experience? No no no!!!
AKL is 100% exotic Africa. The animals alone make it special. The decorations are all African inspired and very, very intriguing. Boma is really an experience in itself and the pool is wonderful. You are close to DAK if you want to go there, but you could almost make your vacation the resort. I really really recommend springing for a savannah room - your kids will just love it! Our son was just over 3 at the time and he was enchanted - but I don't think he was old enough to "get it" - to really understand how cool it is to see a bunch of giraffes right off your balcony. 8 and 10? Great age!!!
Wilderness is set up in a similar fashion, but is all Northwoods/Pacific Northwest. The decor is more Frontier/American Indian. It isn't the slightest bit exotic - maybe more like summer camp upgraded enormously. The pool is great and this resort has a marina and beach. And the boat to the MK is wonderful! Your children will love it - it makes it so easy to just run over to see Spectro and fireworks and avoid the trampling on the way out. Whispering Canyon Cafe is also enormous fun
The Mara (AKL) and Roaring Forks (WL) are similar. Food offerings aren't the same, but the location and eating area near the pools are. I was not surprised to learn the lodges were designed by the same person at all - but the experiences? Completely different. We loved both.
I would highly recommend you enjoy both for what they are. One is really experiencing something away from the familiar and one is like reading and old Boy Scout handbook from camp. You will love them both. And it really was a treat to do both in the same trip. When DS is older, we'll probably do it again, but this time try concierge at AKL so we can do the sunrise safari.
I would really, really recommend you hop over to the Travelchannel.com and look up "Great Hotels" to see when they will be airing the shows for both of these hotels. You will get a great view of what both have to offer and it is a magnificent way to get really excited for your trip. We have them both taped and I would be embarassed to tell you how many times I've watched them...
ENJOY!!!!
Jenn.