Pu 'er Tea of course, boild it with some dry rose in five minutes, three times one day.

You rely on tea to lose weight, that is the problem. Any tea will be better than coke and pepsi to lose weight, the rest is marketing.

The best diet is a change of lifestyle. Stop hitting on that cheeseburger, let the KFC go. Drink water and start walking. Tea will not change everything. Even if you drink 5 liters of Pu'er tea per day, if you're a potato couch munching thousand islands dressing on your salad, you won't notice any difference