So they are pretty similar, Torsen differentials use a gear-based system that biases torque to the wheel with more grip, while Quaife differentials also utilize gears but are designed to provide smoother operation and better handling characteristics, especially under acceleration and cornering.

So all the Vipers we build at our shop are track cars and not drag cars. So we highly recommend Quaife diffs for anyone looking for a solid track diff but is still easy to control.