2: I mean "strength" in a broader sense than caffeine content. I get more jittery from drip coffee (or french press, my personal poison of choice) than I do fro

2: I mean "strength" in a broader sense than caffeine content. I get more jittery from drip coffee (or french press, my personal poison of choice) than I do from espresso - I seem to recall having read that a shot of espresso contains less caffeine than a cup of regular coffee because of the quick extraction. But espresso has a much more intense (stronger) flavour.