Here's my usual post:
Jambo:
large impressive lobby, larger gift shop
busier atmosphere
larger pool, wimpy slide (IMHO)
steam room in workout area
counter service at Mara
value and concierge rooms
Two sinks in studios
rooms retrofitted from existing hotel rooms
Master bath has shower/jetted tub combo plus toilet in one room (toilet is split off)
Parking in lots
Bus to DTD first stop
Rooms on 5th floor, except for 5 2br lockoffs on 6th for concierge
Kidani:
smaller, more intimate lobby and gift shop
quieter atmosphere
splash area at pool, and better slide (IMHO)
rooms designed for DVC
extra bath in one and two bedrooms
separate shower and jetted tub in master bath
community hall
Under building parking
Park buses first stop
Rooms on floors 2 through 5
The walk between Kidani and Jambo lobbies is only about 10 minutes, and there is usually a shuttle (often a van/ golf cart) to take you between the two. You can also use buses. Just be sure to use park buses from Kidani to Jambo, and DTD from Jambo to Kidani.