DVC converted the 5th (and 6th for Concierge) of Jambo. Kidani has rooms on all floors (I think 2-5, due to animals and under bldg parking no 1st floor - whic means Kidani may let you park under your room, near an elevator)
As a conversion, Jambo has slightly smaller rooms. Kidani 1BR has 2 bathrooms, Kidani 2BR has 3..
Jambo has 3 savannah's (2 unique to Jambo, Sunset Savannah is shared) . Kidani has 2 (including one unique to Kidani)
Jambo has 3 dining options (2 TS, Jiko and Boma (buffet) and a CS, Mara) Kidani only has TS Saana with no breakfast served in any form.
Kidani has a newer, more interactive pool area
Jambo has the really large lobby, Kidani is more intimate.
Value and Concierge rooms are only in Jambo. Standard and Savannah view rooms are available at both (I believe something like 70% of Kidani is Savannah?)
Standard rooms in Jambo are pool view only. Standard rooms in Kidani may be pool, parking or landscape view.
Personally, I think I'd use the dining at Jambo more than the other advantages of Kidani, but there are many valid reasons to go either way.