Good matcha has a nice "green" flavor, like seaweed or sweetgrass. Also, the "greener" the tea [or lighter the roast of coffee], the higher the caffeine. Caffeine breaks down with heat and fermentation, so the less-fermented teas, such as green tea, the more caffeine it has. [And likewise, darker roasts of coffee have, due to the longer heating, lost caffeine.]
Good matcha has a nice "green" flavor, like seaweed or sweetgrass.
Also, the "greener" the tea [or lighter the roast of coffee], the higher the caffeine. Caffeine breaks down with heat and fermentation, so the less-fermented teas, such as green tea, the more caffeine it has. [And likewise, darker roasts of coffee have, due to the longer heating, lost caffeine.]