mimmiepnp, we chose AKV for a number of personal reasons, with personal being the emphasis. The things that made us choose AKV, in no particular order, were varied. One was the length of the remaining contract, and getting a little more bang for the buck. There was not a big difference, but some.
The second item was the the room categories. Being a current family of 5, we will have the option of using a one-bedroom (extending or points) and still getting that second bathroom to speed things up getting ready in the mornings and not having to "wait" at the door as often.
We liked the theming as far as the animals are concerned mostly. This is because being 48 and 46, we envision that one day we will have grandchildren to take that will love seeing the animals, and also it won't be too many more years that DW and I will be taking trips alone and not as interested in the commando park runs (and the rides). Where some see the remoteness of AKV as a drawback, we saw the quietness and isolation as a benefit. We can go on trips just to get away and relax, and sitting outside with the savannas to view seemed appealing and peaceful. As for the buses, I don't know how that will work yet since we won't be there for the first time until January, but I have seen complaints about them (but same goes for all of the resorts....especially at busy times of the year) and I have seen reports that they are dedicated and the wait was very minimal (as at other resorts, depending on the time of the year). If it is a problem, we always drive to WDW so we have our car and parking is free for
DVC so if we feel the need to speed up our trips back and forth, then we have that option.
Not sure how the parking will affect us until we actually get a chance to stay at AKV. I am not sure how things will be arranged as far as entrances to Kidani when it is built. If everything goes in through the lobby, then there may be some long walks. I know there are some issues with this in Jambo House if you are towards the ends of a wing.
There are also a number of options for food at AKV, and at SSR they were limited. One day the lack of quiet pools at AKV may be significant to us, but probably not a big drawback.
We have stayed a couple of days at SSR and we had a wonderful time. I don't think you will go wrong with either choice. Like I said the choice should be for personal reasons. The 11 month window is important, but there are some resorts where I don't think that will ever be a biggy for us, since the size of SSR and OKW for starters should provide us ample opportunities to get a change of scenery if we want one. If you chose SSR, I think the same would be true of AKV.
As more DVC is built, it should ease the demand for some of the other resorts if we ever want to try them.
Good luck!