I read few days ago a post from
Angrysnowboarder about the Answer. I have no experience on the Sick Stick but his review could help you to better understand what the bamboo can add to the board.
Both Sick Stick and Answer have the overall same construction and a popster core (to increase the pop) except that Sick Stick has a Pow rocker instead of a flat profile for the Answer, which means certainly that the Sick Stick is better for powder than the Answer.