I know this is not going to help you in your decision making at all, but I agree with Wayne. You will get differing opinions depending on where people have stayed! I'm in the other camp to Wayne, I have stayed at SSR twice, I'm staying there again in October and I've just booked for next year at SSR. We did consider OKW this time and we have been over there to get the scoop but as Wayne said about SSR, we didn't like the feel of the place and it didn't feel right to us.
You will not be disappointed with either choice, both are fairly evenly matched. To settle your dispute, I would base the decision on the factors that are important for you.
Would a slightly bigger room work better for you? (Often the case if you have little ones who like to run around) Then pick OKW.
If you would like to be able to walk to Downtown Disney and want a resort that has a decent counter service? Then SSR is your winner.
Personally, I'm in the SSR camp, but I have nothing "bad" to say about OKW other than it didn't have the right feel for us.