Caffeine
Coffee has more caffeine, so it can give you a quick energy boost, but tea contains a chemical called L-theanine, which, when combined with caffeine, helps you stay mentally alert for longer. That is, drinking coffee gives the body instant energy. But drinking tea provides slow and more sustained energy.
Antioxidants
Antioxidants help reduce inflammation and prevent cell damage caused by free radicals in the body. Coffee and tea contain a variety of antioxidants, but both are particularly high in polyphenols. So both coffee and tea contain compounds that contribute positively to your health.
Coffee also has health benefits. Studies have found that drinking coffee daily reduces the risk of heart disease and neurological, metabolic and liver problems. It has also been found to reduce the risk of leukemia, prostate, endometrial and skin cancers.