Wasabi: Wasabi needs to be grounded into fine pastes before using. Wasabi has a sweet flavor, but once it dries, the sweetness and spiciness will disappear, so it should not be processed into powdered products.
Horseradish: Horseradish has a strong pungent flavor. Fresh horseradish has a flavor of mustard greens and radish, tastes similar to wasabi, and is suitable for being processed into a mustard condiment.