Currently it is pointless to go to Jambo because restaurants, pool, and most services are closed. Assuming there is a a return to normalcy by the time you go, then:
As to the rooms themselves: the Kidani 2BRs are significantly better than Jambo's. Kidani's are about 100 sq ft larger, have a third bathroom, more closet space, and a much better master bathroom (with a separate tub and shower while Jambo has the combined tub and shower) Also, you can reserve a dedicated 2BR at Kidani which has two queens in the second bedroom, rather than a queen and a pull-out couch, and has one long balcony across the bedrooms and living room, while at Jambo all are lock-offs and thus there is a wall on the balcony between the studio and 1BR.
As to parking if you have a car: Kidani wins there too. It has a first floor, under-building parking lot that runs almost throughout the entire building, and with three elevators along each of the two wings, you can always park fairly close to your room. Jambo has a large lot across the road from the front of the building and distance to building and room can be not real bad to absolutely awful depending on where you can find a parking space and where your room is.
Restaurants: Jambo wins with three -- Jiko, an excellent but expensive (even by Disney standards) table service, Boma, an outstanding buffet restaurant, and Mara, a very good quick service restaurant that has lots of seating both inside and outside (in the shade near the entry to the pool area). Kidani has one very good table service restaurant, Sanaa. Jambo also has a impressive bar/drink area where the tables are up on a slanted seating area that rises from one floor to another, while Kidani's bar is just part of Sanaa, near its entrance. You can, of course, travel between Kidani and Jambo and a bus runs all day, front door to front door, for doing so about every 15 minutes.
Lobby and store: Jambo wins with the much larger and more impressive lobby and much larger store, The Kidani lobby is very impressive in itself by not quite in the same league as Jambo's. Also, for an event that has a band, such as New Year's Eve, such will occur only in the Jambo lobby.
Pools: The Jambo pool area and pool is larger than Kidani and one of the best, including in the ability to find shade which at Kidani can often be difficult, but its slide is not long, while Kidani has a long slide. Kidani also has the excellent water-play area for kids, but generally it is best for those 12 and under, and thus likely not a factor in your decision. The food/bar places, Uzima Springs at Jambo and Maji at Kidani, are comparable, but Maji has an area outside but under its roof for tables which is very good for sitting to have a snack or drink (while also watching kids in the water-play area), while Jambo has some tables with umbrellas nearby that are are usually much harder to get than the tables at Maji.
Daily events: both have comparable daily events for kids and others at the pools and lobby and animal viewing areas.
Buses: the bus area at Jambo is a little further from the lobby entrance than Kidani but not any big difference. Kidani has an advantage for getting a seat with park buses because they stop at Kidani first, although at least for MK separate buses often run from either building in the early morning rush times.
Community Hall: a good one at Kidani, Jambo does not have one.
Location of rooms: this is where the differences can be huge. At the u-shaped Jambo building, the distance from lobby to end rooms on the two wings can be very long, longer than anything at Boardwalk, which many consider to be extremely long. However, Kidani makes those distances look like an easy walk in the park. The lobby of the Kidani building faces west. The bus station is on the south wing, while the pool and the Pembe savanna are on the north wing. If you start a walk in the wide hallway at the end of the south wing (closest to Jambo) and walk to and through the lobby area to the end of the north wing, you will cover a distance of about 2/3 of a mile, making Kidani one of the longest single hotel buildings in the world. Those stuck in those end rooms at Kidani, who also have a car, often will drive the car to the lobby when they need to go there.
Savanna view location requests. The better savannas at AKV are Arusha, in the middle of the Jambo building, and Sunset, the largest savanna serving both Jambo and Kidani. Pembe is somewhat mediocre, lacking giraffes and zebras. If you have a savanna view room at Jambo, I would recommend requesting view of Arusha with a room along Zebra Trail (right side of the building). That should provide good views, puts you on the pool and restaurant side of the building, and provides a room that faces west so you avoid blinding sun come into the room in the morning, have some shade on the balcony until later in the afternoon, and see pleasant sunsets in the evening. Since all DVC rooms at Jambo are on the fifth floor, except for the club level rooms on the sixth floor directly above the lobby, it is pointless to request a floor level. Also, one should consider avoiding requesting close to lobby or close to transportation because savanna view rooms meeting either of those requests do not provide the better views. At Kidani, the main objective with savanna view is to get Sunset savanna (which should be requested and is a request highly likely to be met because that includes more than 80% of all savanna view rooms at Kidani).The second objective is to avoid long walks to pool, lobby and buses. A most common request is close to lobby. The problem with it is that it is the most common request, with the result that many do not get it and end up far from lobby. Two with which I have had success in the past are "close to the Rafiki elevator" which is on the north wing and provides shortest possible trip to a gate to the pool and puts lobby and bus station within reasonable striking distance, and "close to the Timon elevator" (on the south wing and provides short trip to bus station and puts lobby and pool within reasonable striking distance).
Standard View location requests. You mention the possibility of getting standard view. Be aware that at Jambo that about 50% of the standard view rooms have pool view and the other 50% have savanna view. So you can actually get a savanna view room. Those are considered not as good as regular savanna view rooms but many of them are almost as good as any savanna view room. Do not request a standard view room that has savanna view because MS will usually tell you no such thing exists. Instead make a specific location request, such as a room along Kudo trail, the left side of the building, because all standards on that side have savanna view (of Sunset). At Kidani most standard views face road, some parking areas, the back of the bus station, front entrance area, and the pool area. If you want the pool area, make that near Rafiki elevator request; if you want close to the bus station request near the Timon elevator. If you actually want to try for savanna view, then the request to make is for a room near the Pumba elevator, which would give you a standard view room overlooking Pembe savanna. However, your room will be far from lobby and bus station.
With any room location requests at Kidani, you can request lower or higher floor. All rooms are on floors 2 through 5. Some like lower floors for more direct sighting of animals. Personally, floor level does not matter to me because higher floor has the counter-advantage of providing a more panoramic view. Moreover. order of requests is important and one should not make requests for Sunset savanna view or areas closer to pool or bus second or third in line after a lower floor request.
