High depends on different factors.
I understand that "high" depends on a strain potency, but seriously, does non licensed grower send his buds for testing in lab?
One just have to believe that one particular strain is more potent than other, but there is no actual proof as potency depends a lot on growing conditions.
So, I think there 2 items left to consider:
1. Kind of strain (indica/sativa/hybrid) - some strains are calming, a very small amount can make one sleepy, others are energetic and keep one going through the day.
If you just want to get stupidly stoned - you should choose indica or hybrid, but you should always read strain effects description before purchasing seeds.
2. Way of consuming - waping, smoking, eating. I think ingesting edibles on empty stomach will make you really stoned, but it will take longer to have an effect.