Health-wise any variety of tea has its specific health benefits.
Flavonoid content of black and green teas: Black and green teas both contain similar amount of flavonoids, however they differ in their chemical structure. Green teas contain more of the simple flavonoids called catechins, while the oxidation that the leaves undergo to make black tea converts these simple flavonoids to the more complex varieties called theaflavins and thearubigins.
*Green Tea and Black Tea more similar than different.
*Oxidation is the deciding factor that makes a tea Green or Black.
*Good quality Green Tea and average Black Teas contain similar amounts of
*The health benefits of both teas are similar too.