Carbon poles give a significant weightsaving over alloy, making crew work a lot easier and reducing weight in the bow of the boat.
Choosing the right pole:
A boat with a higher than usual righting moment may require a slightly heavier pole.
A pole that is only used for running can be lighter than an all purpose pole which will also be used for reaching.
Choose the correct tube for your boat based on pole usage; boat righting moment and spinnaker size.