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I'm not sure what you mean by more useful?

more healthy

All tea is healthy. Just the act of taking time to enjoy a cup of tea is healthy. Black, White, Green, Oolong, Pu'er... they are all leaves of the same plant. Whatever tea you drink, it's best to find a source which comes direct from small family farms, that practice chemical free, sustainable agriculture. I prefer http://verdanttea.com - Cheers!