A. It's a question many ask when they walk into a famous coffee shop. The answer, however, is not so simple. While there are a few drinks that pack more of a punch than others, it depends on how you order them. For example, iced coffees have less caffeine than hot coffees because the ice dilutes the coffee. So, if you're looking for the most caffeinated Starbucks drinks, it's best to stick to hot coffees and espresso drinks.