We like all 3 and would never consider staying there as being stuck.
OKW, largest rooms, studios there will have two queen size beds. SSR and Kidani will have a queen bed and sofa bed. That would be the deal breaker for me. I would want two beds.
That said, OKW and SSR have the most central location to all things at Disney World. You are not that far to any park. Kidani on the other hand is a good bit further to every park except Animal Kingdom. It is the furthest
DVC resort to the Magic Kingdom.
All have very nice, fun pools. SSR has a new themed pool at the Paddocks which is really nice. Kidani only has the one pool however you can go over to Jambo House. SSR and OKW have more pools.
Also Kidani does not have a quick service restaurant, you have to go over to Jambo House for quick service.
Of the 3, SSR has the best quick service, as they have a new one at the Paddock Pool and then the main one in the Carriage House.
SSR rooms are being redone and should be finished by your trip. They are being done with a Fox and Hound theme.
SSR is closest to Downtown Disney which is nice.
Kidani is hotel set up, SSR and OKW are Condo set up.