I think the bigger question is....do you want to spend the extra money on the moderate? If so, moderate offers a little more than the value. As for swimming, moderate resorts offer slides, value resorts do not.
Our first resort was a value, our second was a moderate. After staying at the moderate, we both said we would not go back to the value. For us the value resort was a little to crazy. Don't get me wrong, moderates can get crazy too, but we just don't feel it as much as we did in the value.
With the age of your children, I would recommend PO French Quarter. It is a MUCH smaller resort and very easy to get around. Nice swimming, short walk to main building, dining, bus stop, swimming and the boat to DTD. POFQ is also the first bus stop, so you should always get a spot on the bus. The bus then goes to POR. You can also walk, bus, or boat over to POR to enjoy what that resort has to offer.
Let us know if you have any other questions.