imvho, thc %'s is only a fraction of the equation of what makes a good smoke, and i don't really think that a higher % number means a stronger smoke, far from it indeed.. there are way too many factors that play a role in what gets us high and we haven't even begun to unlock any of the science behind it..
i look at it like this though.. go get some 80 proof vodka.. take a couple of shots of it.. now go get the same vodka, but this time get the 100 proof stuff .. take a couple of shots of it.. what's really the difference at the end of the day, you're still drunk after a couple of shots of either one.. imo, it's pretty much the same as smoking cannabis where one is 25% and one is 15%