My understanding is based on 5 stays, all at Jambo (4
DVC villas,) 3 Wanyama safaris and 1 lunch with an animal specialist at Sanaa. Things change, so my info. may not be 100% accurate.
Pembe has it's own barn which is not tall enough for giraffes - so I'm surprised to read that a giraffe was on Pembe. This last December they had a male zebra and a female with baby zebra on a section of Pembe that they had fenced off. AK is part of a breeding program for that species of zebra and initially they had a stallion with the females on Sunset but that was too disruptive so the smaller pens on Pembe were the solution, plus two of the female zebras don't get along with each other so they alternate which is on Pembe and which on Sunset. Sunset has it's own barn, a small herd of zebra, lots of bird species and several more animals. It's also the largest savanna.
Arusha and Uzima are the same size and they share a barn - so they bring the Arusha animals in and feed/medicate/check them then let them out and bring in the Uzima animals.
The 3 large savannas (Sunset, Arusha and Uzima) all have giraffes these days and usually at least a pair of zebras.
They do move animals around - for example Gordon, my avatar pix, started out in the park, but his interest in the Kilimanjaro Safari ride trucks created a problem so he was moved to AKL Uzima savanna. His fascination with trucks continued and he started lurking near Uzima's exit gate to intercept the safari trucks, so he was moved to Arusha savanna where he was last Dec.. Not sure where he is now as he was happily destroying some stands of foliage on Arusha last Dec..
So there's occasional movement of animals between the park and the lodge and among the savannas at the lodge to deal w/ issues that arise.
At Jambo the villas are on the 5th & 6th floor, whereas at Kidani you could be on any floor. If seeing animals was my sole aim, I'd opt for Kidani hoping for 2nd or 3rd floor Sunset savanna view. The villas are bigger & have more bathrooms at Kidani as well and the park buses stop there first. Personally I love the ambiance of Jambo's lobby, the proximity to Mara, the size of Jambo's pool, etc. so I tend to end up at Jambo.