I agree with the previous two posters.
Which theme do you think you and your kids will prefer? If it is AoA, the cost savings make it a no brainer. If, however, you prefer the AKL enough to justify the price difference, I say go for it.
Like the PP, I would always go for a deluxe over a value/mod if budget allowed. The ambiance, amenities and restaurants at AKL are fantastic. I have yet to visit AoA, but it appears to be much more whimsical and "in your face" like the other values. Fun for kids, but maybe not as big of a hit with adults as the more toned down deluxes are.
Again, tastes differ-- choose what looks like the better deal to you! But I would personally scrimp on other things to make up for that $500 difference staying in a 2BR at AKL. Have fun whatever you decide!