The Rebel does not compare directly against the Bandit. The Bandit compares much better against our Evo (or, in a month, our Dice). The delta shape is an all-rounder meaning it can do freeride, waves, or freestyle. The Rebel is pretty specifically a performance freeride kite, and (in my opinion) will be the better kite for general comfort while riding, more responsive especially when depowered, and bigger jumping/hangtime. While you can unhook on the Rebel for basic unhooked waveriding or raileys, the delta shaped kites such as the Bandit or Evo tend to sit deeper in the window and give you a steadier kite for unhooking, with a little more slack after your pop to make aerial handlepasses easier.
Also realize that delta kites have more grunt and less top-end... Rebels tend to give up just a little bit on the low end grunt but you get significantly more top end out of them, and they perform better when depowered.
Hope this helps, but as always, you're best off demoing gear if it's possible.
Thinking of going for the Evo now. How does the Evo compare to the Rebel in terms of boosting big air and hang time?