Hey jessgood!
I'm sure you won't be disappointed with either WL or AKL. They are both very cozy, family-friendly resorts with a lot to offer. We've stayed at both, and although we love WL above all else, we remember fondly the time spent at AKL.
The boat from WL to MK is definitely a plus, as is the nightly Electrical Water Parade on the lagoon. The swimming pool, although not as large as AKL, is good-sized, and there is a kiddie pool for the little ones. The atmosphere is just so welcoming that we feel like we're coming home each time we visit
Now at AKL, we booked a savannah room, so of course that cost a lot more than our standard room at WL. But if you get a decent view, the animals outside your window in the morning at feeding time is definitely well worth the price. The kids would sit on the balcony with their binoculars (to see the animals that weren't on our savannah, or birds, etc), and hold the animal ID chart that was in the room, trying to match animal to description. It was great fun and educational too. Then, as mentioned, the pool area is huge, with a zero entry and a great slide. Like WL, there are two wonderful restaurants in the resort, as well as a fast food place. The only drawback to AKL, in my mind, was the necessity to drive everywhere.
Lastly, I wanted to add to the other poster's comments that your kids will probably fall in love with MK ten times more than IOA. Except for the Seuss Landing area, there really is not that much for the little ones to do and see at that park, in comparison to the Magic Kingdom.
Don't worry! You'll have a magical time, no matter what you decide
