DH & I have stayed at both POFQ & AsM, and I have to put in my vote for POFQ. We have stayed at several resorts, but it is still our favorite! We like the boat ride, the theming, and especially the fact that the resort is so much smaller and has a more intimate feel to it. It is a short walk to the food court from any room. And there are amenities there you don't have at the value resort. I also think the pool would be a hit with your 5 yr old. But, the icons at AsM would be a hit, too. The value resorts are a little more noisy and depending on which room you get, it may be a long walk to food court or bus stops.
That reminds me, another thing I like about the non-value resorts is the benches at the bus stops. If the busses happen to be running a long time between, I'd rather sit and wait than tire out my legs before I hit the parks! It may seem silly, but that's just how I feel. We are staying at Pop Century this time, and I dread the line withno benches while waiting for the bus.
I'm sure you will have a wonderful time no matter which resort you choose...after all, you are staying at Disney! Good Luck!
Lori