Coffee or tea: Which drink boosts productivity better? Coffee delivers a stronger caffeine boost for quick energy and alertness, while tea offers steadier focus through its combination of caffeine and L-theanine. Choosing the right beverage depends on individual needs, but moderation and adequate sleep remain the biggest contributors to productivity. Coffee contains more caffeine than tea, making it a popular choice for people who need a quick burst of energy and improved alertness. If you’re tackling a deadline or need an immediate energy boost, coffee may be more effective.