I will tag on what everyone else said with some standard differences:
If driving a Car, at Jambo you park in a huge uncovered parking lot, while at Kadani you park underground and can be very close to an elevator that takes you close to your room (ie, much less walk than with Jambo)
If you have a standard 1bdrm and up at Kandani you get an extra bathroom (1 brm has two seperate bathrooms, 2 brm has three, etc.)
Jambo has the BIG lobby and Kadani has a much smaller lobby with lower ceiling.
Jambo has a bigger pool.
Kadani (usually) picks up and drops off first with the busses, then to Jambo being the second pickup/drop off.
There is a shuttle van (which actually might not be running right now) that goes between each resort.
Be sure to check out hidden corners in the pool area, there are some areas with animal viewing that are not apparent at each.