If you plan to spend any quality time outside of the parks, enjoying wherever you stay, choose a cabin & don't think twice. The only thing the Value Resorts really have over FW is themed pools.
And you can recoup at least some of the difference in cost (if you want) by having some meals in the cabin, since you do have the full kitchen. Granted, who wants to cook on vacation? But maybe heat up some frozen pizzas or microwaveable breakfast sandwiches, cold cuts for some lunches, cereal & muffins or bagels for a breakfast or two. Popcorn as a snack, and plenty of colas & juices so you don't have to do take long treks to fill up your deceptively shallow refillable mug, nor will you have to pay the high vending machine prices. Heck, with 6 people, even some of them being wee ones, counter service meals will usually run you over 50 bucks. I know, the Value suites have a microwave & tiny fridge, but you'll have more options with the kitchen in the cabin.