Cutting a stock shifter gives you a shorter handle. THAT'S IT!
The throw is still the same.
The B&M changes the angle below the fulcrum point to actually make the throw shorter. It also shortens the handle.
If you want to take that a step further the Steeda raises the fulcrum point to allow even a bit more change in angle below the fulcrum point.
Both shorten the actual "throw"
Cutting a stock one only shortens the handle. Just hold the shifter lower.

Unless you mean just a "looks" mod.