With wristers it always seemed to me that people who shot 'the American way' with their stronger hand low, had the harder wrist shot. Not based on pros or anything, but just people my age and my brothers age.
Shooting with my right hand low (as a natural right hander) I can roof wristers with a lot of power generated but cannot coordinate a slapshot for my life... my brother is right handed and shoots left and cannot get a puck off the ground with a wrister but has a very powerful slapshot.
Come to think of it three of the guys with the best wristshots I have seen on the Flyers are Carter, Lindros and Giroux... and all shoot with their naturally strong hand low.
But then again Gagne and LeClair are also naturally right handed but shoot left...