What's the difference between a ball card slingshot and a traditional slingshot?

Traditional bows are mostly light bows, which are as powerful as heavy bows with wrist rests. But there is another saying, what is the difference between a bow-heavy slingshot and a traditional one? -The bow of the heavy bow should be made accurately, and with the wrist rest, the traditional bow (light bow) can be fired by cutting, and the accuracy can be higher than that of the traditional bow. It's hard to shoot accurately without wrist strength.