Kidani 2BR is about 100 sq ft larger than Jambo (that is a very noticeable difference). It has the three bathrooms and the master bath connects to the master bedroom and has separate tub and shower. Jambo has a master bath with a hallway between the bedroom and bath and those in the living room can see into the hallway. Its master bathroom also has a combined tub and shower rather than separate and the tub has very high sides to step over to get in. Also Kidani has dedicated 2BRs (can only be a 2BR and has one entry door) in addition to lock-offs (connecting studio and 1BR with the resulting two entry doors) while Jambo has only lock-offs. The dedicated provides one long balcony extending across the entire unit while the lock-off has a wall between the studio and 1BR units.
Most standard rooms at Jambo overlook the pool; none overlook the parking lot. Effective Jan 2012, they converted a small number of savanna view rooms to standard because their views were not that good (but obviously a stroke of good fortune if you get one as standard). You are incorrect that all standards at Kidani have parking lot view. About half have road and lot view. Most of the rest have pool view with some of those getting a partial view of Pembe savana, and then, in 2012, they converted a few savanna views on the north end overlooking Pembe to standard also because the views are not good.
Jambo offers three restaurants (table service, buffet, and counter service) and the larger pool with many shaded areas to sit in, larger lobby, and larger store. Kidani offers a pool with the longer slide but shade is still a thing at a premium as trees grow, and one of the best table service restaurants on site (Sanna) but it has no breakfast service. Kidani also has the elaborate kids water play area. Kidani has a community hall, Jambo not. If you have a car, Jambo's parking is in a large lot across the road from the front entrance that can leave ou with a rather long walk unless you find a place claose, while Kidani offers ideal under building parking and with eleavators spread out along the wings you can always park somewhat close to your room.
Personal view is that if you are getting a 1 or 2BR, Kidani is the choice for the better room but if getting studio or GV, Jambo is the choice. If Kidani standard I would likely request a room close to the Rafiki elevator and high floor, which area gives you the shortest walk to the pool and creates a possiblity of getting a partial Pembe savanna view.