So please if anyone has been to either, or better still, both please could you tell us the good and bad.
We have stayed at both resorts, and for us, we would personally choose SSR over OKW.
We had a 1BR at SSR, and a studio over at OKW.
With OKW, we had two major issues - the counter service and size of the room. If you read the statistics on OKW, you will see that the studio rooms have more physical spaces than any of the other deluxe villa resorts. However, the studio rooms are all end rooms on corners of blocks, which means that the room is more a square shape, with a triangle on one end, as opposed to the basic rectangular shape of other studios, like at SSR. The upshot of it is that we found that the room *felt* smaller, even though it have more physical square foot size.
2 beds is a bonus, but it all depends on the size of the family. We are 3 adults, and we are quite happy with just a queen and the sofa bed, which we rarely actually pull out. Mum is usually quite happy to crash on the sofa, as a sofa! So, the extra bed is not really of concern for us, but could be a big plus if you have kids.
The counter service is also a problem, with no indoor seating to eat your meal. You can either sit outside under the umbrellas and eat, which is great unless the sun is up or it's raining, otherwise you have to take it back to your room. Again, great if you're nearby, not so great if you are miles away, especially if you have no car.
That said, if you were going for a 1BR, then personally we would actually overlook the things that we don't like about OKW and stay there, simply because of the sheer size of the 1BR apartments. Plus, with a 1BR, there's plenty of room in the kitchen to cook your own meals and not have to worry about the CS situation!
We like SSR, although they will be starting the renovations soon (if not already) for the pool expansion. There is just something about SSR that captured our imagination, and it always feels like home now. Ironic really, since we only stayed at SSR because we had to - it was the only place our extra DVC points were valid!
SSR is probably just as spread out as OKW, although it doesn't feel quite so wide and far away. Due to the nature of the resort, there will, just like OKW, be places that are far away from the main hub of things. There is a good CS at SSR (with much better options than OKW) and has that all important indoor seating area!!!
Both sites have pools with slides, and quiet pools. They all have food and shops. It really comes down to personal choice, and whether you are going to be spending more time in your room, or whether you need it simply for a base.
Personally, if you want a studio, go SSR. If you want a 1BR, go OKW.
. We had a car but only used it for shopping runs - it sat there most of the holiday. The bus service was excellent - never had more than a fifteen min wait even when we just missed a bus. 
