Which tea (black, grey,etc) has caffeine which tea has highest level of caffeine?

Question

I want o give up coffee

Answer 1

Go for the darker teas: black, assam, earl grey... Starbucks has a black tea blend called Awake.

Oxidation or fermentation has nothing to do with caffeine levels.  Caffeine in tea is naturally occurring and is due to several factors such as leaf type, soil content, portion of the leaf...

Answer 2

Black teas, the darker the higher the caffeine.

Answer 3

black tea has the highest because it's the most oxidized of the true teas.  Green tea and white tea are not processed (or oxidized) as much, hence less caffeine.  But the green and white teas retain the most antioxidants.  More so than the black teas.