The blade shapes are vastly different as well as, ZT's have .080 liners or framelocks, and are recurved, and are not all asst. opening. Emersons have .050 liners(the thicker ones) and chisel grind blades. Emerson also has about 5 different blade styles, and not all of them have the wave. Out of those 2, the Commander is about 125.00
cheaper, but with a much thinner lock. Wave is faster opening out of pocket than asst. opening. Dunno, get what you like.