With an Oct 20 arrival date, you should be contacting rental agencies or renting members now to look for a reservation. As noted, Jambo has a lot fewer rooms than Kidani and invariably fills faster than Kidani. Also, all Jambo 2BRs are lock-offs and thus can be removed from inventory via studio reservations .
The Kidani 2BR is about 100 sg ft larger than both BRV and Jambo 2BRs, and also has the advantage of having three bathrooms rather than BRV's and Jambo's two. I would also vote for Kidani for that reason and one noted above about BRV's need for refurb. Note if you get a reservation through a member (or rental agency that goes through members) for a 2BR savanna view, you should likely request to have the member put in two room requests (non-guaranteed) through member services for a room: (a) overlooking the Sunset savanna (the larger savanna at Kidani with more than 80% of Kidani's savanna view rooms, which has giraffes and zebras; the other, smaller Pembe savanna does not); and (b) either close to the Timon elevator (to be close to the bus stop and not too far from the lobby), or close to the Rafiki elevator (provides shortest trip from building to pool and not too far from the lobby and bus station). Getting either of those two near-elevator requests avoids the extremely long walks from lobby to room mentioned above (which can be up to 1/3 mile). Note, do not just put in a request to be "near the lobby," or near "an elevator" without naming the elevator. The former is the most made request at Kidani, with the result that many do not succeed in getting it and often end up with a room very far from the lobby; the latter is a pointless request because there are three elevator banks spread out along each of the two wings and a "near elevator" request can result in being placed in any room in the building.