If you paddle rough water and are serious about you're paddling ,drifter ,I would go for an electric bilge pump .Those hand pumps are bloody useless if you are trying to empty a half cockpit of water out .Get into trouble in rough conditions and you want to get out of there in a hurry,hit the pump switch and get paddling ,lot better than sitting there with a hand pump for 10 minutes.Try an experiment,capsize your boat ,right it again and try pumping it out with a hand pump,while sitting in the cockpit.Electric are more expensive sure, and can be a pain in the butt to fit but well worth the effort.