Actually (green) tea leaves have more caffeine per gram than coffee beans do, but in general you use more coffee (~60 g/l) for your cup than tea leaves (~12 g/l) and hotter water, so more caffeine is released.
However, tea leaves are safe for consumption, so you could eat them instead (for example as a salad).
However, tea leaves are safe for consumption, so you could eat them instead (for example as a salad).