Depends on room size and if quick service dining at the resort is important.
Except for the Studios, the rooms at Kidani Village are larger than those at Jambo House. If looking for a 2-bedroom, only Kidani Village will have dedicated 2-bedrooms available. All Jambo House 2-bedrooms are lock-offs which is a studio and a 1-bedroom with a connecting door. The studio is the second bedroom in a lock-off and will have it's own door to the hallway. Kidani Village also has 2-bedroom lock-offs available. Dedicated and Lock-off are booking categories within the 2-bedroom category and you will know when you book which you have.
Only Jambo House has quick service dining (The Mara). Kidani Village has a very good table service restaurant (Sanaa), but it's not open for breakfast.