I have tried them all and have there may be a little more variation in potency with the Ecuadors, Golden Teachers, and the Treasure Coasts. The PF seems to be the most stable and by far the easiest to work with. But many other people feel different. I think the PF strain is the most forgiving in a wide variety of circumstances, and the other strains prefer more specific environmental parameters, which a few get lucky and have and others fail because they don't .