Smooth.
When cutting, the board edge cuts into the snow surface smoothly, which is safer and more stable. The force-bearing area is enlarged, the resistance is small, and it is smoother. The resistance of rubbing snow is greater, rougher, and less precise, so the blade is smoother than rubbing snow.
The edge is also called the carving edge. It is a technique used by snowboarders to negotiate curves. The force is exerted through the hip bones, making the lines smooth and perfect, and the experience is smooth.