These are both good value for larger families. I have stayed in both and vote for OKW 1 bedroom. It has amazing space and a more accessible bathroom with a Jacuzzi tub.
One thing I haven't seen mentioned is the grounds. I did not care for the grounds at Wilderness cabins - basically all of the cabins were right on top of each other. The view from the decks are just basically pine trees, pine needles and other cabins. The porch on the OKW was covered and I had a lovely view of the lake/fountains. It was really relaxing.
Both resorts are a bit removed from the parks and food options which could be a plus or minus (my husband likes being far from the parks, while I prefer being near the action). I found the transportation at Wilderness cabins to be less convenient. You needed to take an internal bus to get anywhere which added a fair bit of extra time. OKW looped around the resort, but you only had to take one bus.
A plus for Wilderness cabins was the beach area and view of the nighttime water parade, and some free fun activities like the chip and dale marshmallow roast thingie.
Have you looked at AoA family suites? Sure, it is a value, but the room set up is really nice, and I really liked the bus service and food court.