I have drunk green tea for approximately five months, 20 minutes after each meal, and that has helped me to speed up my metabolism. Of course, I also exercise.
You can drink it maximum three times a day, for 15 days, and then leave it another 15 days, you will see the results in about a month.
Actually, I have not drunk other drinks, I have not tried, but I felt very happy with green tea. I invite you to look for more in google.