True haze strains are pure sativa. In my experience, most of the quality comes from how a strain is grown, not the genetics. Sure, genetically every plant has a peak THC production that it can't surpass. Most of the flavor and the overall quality of the bud comes from the soil and what the farmer adds to it, though. I've seen people take seeds out of bags of shwag and grow some of the most beautiful, flavorful, and potent buds I've ever had. The shwag plants that I saw grew straight up, branching little or none at all. They had a very kush-like appearence and grew very kush-like buds. The leaves were very dark. The farmer told me that he actually like the shwag plants more than the AK-47 plants next to them because he was able to feed the shwag plants more and they produced, larger, tastier buds. I smoked some and he wasn't kidding. The genetics he had gotten basically for free smoked smoother and tastier and got me higher than the AK. Now, I'm not trying to say that AK-47 isn't good cannabis. I really enjoy the strain. The point is that each grower finds strains that, for whatever reason, they can get the full potential out of. Most of the quality in good grass comes from a grower who knows what his plants what and gives it to them.