I vote for CSR. More amenities, which is real nice when you have little ones. Bigger rooms with coffeemaker, coffee, mugs, iron, board, hairdryer. Limited room service-even breakfast. Great pool area with playground and kiddie pool right there. The Pepper market is another plus. You are seated , brought your drinks, and you pay after your meal. No trying to balance a tray of food and drinks while paying and then trying to "find" a table. The resort is sooo pretty at night. Put the kids in the stroller and walk around the lake! Nice quiet pools with laundry nearby and excellent bus service. I have stayed at both resorts and liked both, but there is no comparison. The kids would like the theming of ASMo, but if they are under three they may not even really "see" it. When my son was 3 we were at World of Disney at DTD and I was pointing out some of the characters. He looked with no reaction at all!
You will get plenty of "Disney" at the parks. I would go for comfort at your resort!