Wow! What a decision! At least the rates are pretty comparable.
I have stayed at neither, so I will try my best!
Cabins- I would choose this if you are looking for a more "peaceful" vacation. I saw the insides on the Great Hotels episode which featured the WL and they looked very cute! You could definitely save on food, by eating somem meals here. Definitely breakfast and I would bring some lunch items and snacks/drinks/coffee/water. The nighttime activites, hayride and petting zoo could provide some nice diversions. I don't know much about the pool. I think the only drawback wouldl be transportation. You do have the boat to the MK, if you plan on spending a lot of time there. Perhaps with money you save on food , you could rent car and that would be solved.
Contemporary- if you want to be in the middle of the magic and your kids won't drive you crazy, I would do this. Although, I don't think I woud want to stay here unless it were a tower room. You have the monorail, but still have to share buses to the other theme parks.Actually, I am leaning more away from the CR as I write think about it. If you could swing two rooms at a mod, I think you would be happier with the extra space, extra bathroom, good food courts, and good bus transportation (both CBR and CSR are nice). Plus, they also have pool slides (CSR 's is much bigger). Check mousesavers to see if there are any codes you can use.
Right now,I'm leaning towrds the cabin between those two choices.