Ok I have heard so many talking about 20%, 23%, 29% and so on. I have smoked one hell of a lot of fine bud in my 35 years of toking, but hands down by far is Haze for a sativa high. And White Widow. I had a buddy of mine run some of my white widow thru his lab at work and it came back @ 22.137%.
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I am now growing Blueberry, brain wreck, black pearl, hash plant, avalanche, Northren lights, big bud, White Widow, super bud, haze, cluster bomb, monster bud, purple power, ak-47 and kush. When these crops finish I will have my buddy test these out for thc %. When test results come back i'll post them for you all to check out!
But let us keep in mind that curing your bud the right way makes a huge diff!
Also depends on 60% red hair vs 70% red hair when harvesting. One other factor to take into account is the nutes used to grow with.