There are four types of tea: green, white, black, and oolong. All of these are derived from the same plant, and all are being studied for their considerable health-giving properties.
Of the four types, green tea seems to be the most healthful.
Dried green tea leaves are about 40% polyphenols by weight. Both green and white teas contain the most EGCG, which is a powerful antioxidant.
https://foodrevolution.org/blog/tea-health-benefits/
Toms Blog on Life and Livingness