help me see the difference

Wife bought me a little 25 dollar blaster at harbor freight for Christmas. I guess I'll experiment with the various medias.
Just be sure to wear a tight-fitting respirator while blasting. The silica in most blasting media will kill you graveyard dead from silicosis. Northern Tool usually has glass media for a decent price, and it works well. I previously had sand in my blast cabinet, but recently swapped it out to the glass. It works MUCH better.