I don't know if there is any quality difference between powdered and fresh. But I want to suggest that you give the fresh a chance, and try different sources for your fresh wheatgrass til you find a good one. My favorite is tthe Wild Oats close to where I live, theirs is organic and always tastes really sweet. I have been drinking 2 oz every day now for almost 3 months and I have actually become REALLY into the flavor, and I promise , I GAGGED at first. I tried the wheatgrass juice at another healthfood bar yesterday and it wasnt as good, watery, oaty tasting like grass cuttings.
I have just started doing TCM and herbs and have found my appetite/food cravings really really changed and I am craving greens and wheatgrass juice.
laura 44 TTC #1 in LA