Continuous rocker - A smooth curve from one end of the board to the other. This gives a smooth consistent pop off the wake, continuous rocker boards typically tend to land softer on the water.
3 Stage rocker - This is as it sounds - flat in the middle, with a kick up at each end. When riding this board up the wake it will give a more abrupt pop, sending the rider higher into the air. This is harder to control, as requires good timing to get the best out of it. Due to the flat spot in the middle, these types of boards typically tend to land harder on the water.