If you do decide on Kidani, I recommend requesting lower floor, close to the lobby. In Jambo,
DVC rooms are up on the 5th and 6th floors, and at Kidani you can be much closer to the animals. Close to the lobby helps eliminate some of the looooong walks, but again, it's only a request.
As for getting to Jambo for CS at Mara, you can take any park bus, and often there is a van or golf cart running between the two AKV houses.