there is no most potent strain, there is always new strains being crossbred with more and more thc, i mean sure there are a few that haev the highest amount of thc, but there is always ways to change that . And there is no set amount of thc% it all depends on how its grown. Purple haze the strain is dead, but the term purple haze is like the term chronic. I mean there is a strain chronic, but chronic is just a term for decently bomb bud. Purple haze is a term for bomb purple bud, not purple schwag.