The heavy grade blade is just a thicker blade used for dueling purposes. The Ultraedge blade is made of a white polycarbonate for a fuller brighter look. You'll have to look at some comparisons that people have posted on here to choose which you would like personally. Everyone has their own opinions. I wanted the Ultraedge for the more full looking blade but they didn't have them in stock when i ordered. I am going to order them soon though