Chopping requires a different geometry than slicing. A sashimi blade with a chisel grind is very sharp, and will often out-cut a standard grind.It works by the applied force being drawn across the cutting object. On a chopper, the force is delivered in a directional manner, straight into the object. This requires a perfectly matches set of bevels on both sides. A convex grind may work best for heavy use choppers.
Stacy