Not as far as I can see. I'm not a fan of tea or coffee, so my only viable source of caffeine is either soda or pills. In this situation it's obvious pills win out. If you enjoy green tea then stick with it.
Maybe buy some pills for the odd occasion when you need caffeine but don't have any tea on hand?
This is the public group instrumental rationality diary for December 16-31.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: December 1-15
Rationality diaries archive