Hi, all: I have a Snapper 21" mower (non self-propelled). I went to get a new mulching blade at my dealer and was presented with 2 options. The "standard" mulching blade or the "Ninja" blade. I had the intent of coming home with the Ninja blade as that is what I saw on the Snapper website. However, the dealer told me that the standard mulching blade was better (and about $5 cheaper). Do any of you have an opinion as to the better blade ? Thanks, Rob on edit: The type of grass we have in this area is St. Augustine.