If you’re a big drinker of either, a great run-down of the differences between the two!  It might help sway your choice of your daily dose… –

Theaflavins, thearubigins, and catechins are the primary ones in black tea, while coffee is rich in flavonoids and chlorogenic acid (CGA) (30, 31Trusted Source).

A recent test-tube study discovered that theaflavins and thearubigins inhibited the growth of lung and colon cancer cells and ultimately killed them (32Trusted Source).

Studies in leukemia cells revealed similar results, suggesting that black tea may have cancer-protective properties, though more research is needed (33Trusted Source).

On the other hand, test-tube studies on coffee’s anticancer properties have found that its CGA content acts as a potent inhibitor of cancer cell growth, protecting against gastrointestinal and liver cancer (34Trusted Source, 35Trusted Source).

Long-term studies in humans and further research that has analyzed larger pools of evidence show that coffee and tea may also protect against other kinds of cancers, such as breast, colon, bladder, and rectum cancer (36Trusted Source, 37Trusted Source, 38Trusted Source, 39Trusted Source, 40Trusted Source).

Aside from their antioxidant activities, polyphenols have been linked to a reduced rate of heart disease (41Trusted Source).

Source: Coffee vs. Tea: Is One Healthier Than the Other? – EcoWatch