Country of origin alone does not tell you everything about a tea. Black and green teas from different places can vary by cultivar, growing conditions, harvest, processing and storage.
For a useful comparison, brew two black teas with the same water temperature, quantity and time. Compare aroma, body, bitterness and finish. Then repeat with green teas using cooler water.
There is no single best tea for everyone. Your preferred cup might be a rich black tea with breakfast or a smooth green tea in the afternoon.
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