Kidani studios may be a litttle larger, newer, and you have the possibility of getting a lower floor savannah view, and are closer to he newer pool area and Saana.
Jambo gets you close to the main AKV restaurants, including a CS and breakfast options (no breakfast served at Kidani, and here is no CS at Kidani).
Personally, I would choose Jambo because I would dine in Jambo more frequently than I would use any of the Kidani ammenities. If you would use Kidani ammenities more than Jambo, then Kidani makes a good choice...