As I am looking at pictures of the various laser-guns out there I noticed one interesting difference between the Ocean Hunter controller and Galaxian3 controller.
The ocean hunter gun has its x-axis rotaion center in the middle under its body.

The Galaxian3 gun, which I also noticed is very much like the Starblade gun, has its x-rotation center placed further to its front.

This is very interesting, the OC-gun reqiures less movement than the G3/starblade-gun, but it also takes more force to quickly move the OC-gun because its radius from center to handles is shorter. The G3-gun would have more accuracy in this case than the OC-gun. How they differ in practice I sadly don't know. It would be very interesting to play starblade trying both the OC-gun and the G3, or Starblade-gun.
The shapes of the guns, I would say, suggests that the OC-gun is really a gun with which you aim and shoot. Where with the Galaxian/starblade gun, even though you do aim, you infact relay the movement to the laser-guns outside the ship.