The two most common hook types are rotary hooks and oscillating hooks. Rotary hooks spin around 360 degrees while oscillating hooks rotate about 200 degrees before doubling back on itself and never complete a full rotation. For the vast majority of people, there is no practical difference. As a rule of thumb, rotary hooks are capable of achieving much higher top speeds because there is minimal resistance on the hook when spinning all the way around. Oscillating hooks on the other hand, need to reverse momentum with each oscillation, thereby introducing a ton more resistance and vibration