The difference is it is easy to apply. Its pellets and you chuck them round. No mixing my brews and fluffing about. Lots of people justr want to chuck something on more than get brews ready. It is jsut a good alternative. I use it heaps and it does contain some nutrients in organic forms.
Its not about just one thing and a variety of organic bio-stimulants are going to ensure a very healthy soil and that will then give you a very healthy plant if it happens to be growing in the soil.