You will get so many opinions because different things bother different people! My take...
I've stayed at both and Jambo will be my pick forevermore. I stayed at Kidani knowing the halls were long but really I cannot express how long they were! Lol. I'm no wuss either, I do Disney commando style, ran a half marathon and 20 hours later was still up walking the parks but those kidani hallways nearly killed me this last trip!
I know I was comparing to Jambo and I loved Jambo so much that Kidani just couldn't compare for me. Some say the pool is better at Kidani, I prefer Jambo and again, another walk to the pool and you have to go out of the lobby to get to it. I found it strange but get why they had to put it out front because the savanna is in back.
Lobby is smaller at Kidani, gift shop smaller, no counter service restaurant (although I think you can get CS breakfast at Sanaa, we are rope droppers so I didnt check).
Bus service at Kidani gets a bonus point because nearly always they pick up kidani first so you always get a seat!
I LOVE AKL, it is my favorite resort, and you will have a fantastic time but I dont think it would be worth it to switch, I would just pick one and stay. The rooms are nearly the same, they both have great savanna's and the theming is amazing at both and the same for the most part.