Does decaf green/black tea still have antioxidants in it? Or better to drink regular?

There are three. main varieties of tea--green, black and oolong. Of the three, green tea contains the most antioxidants, called catechins. Unfortunately, the decaffeination process does remove some anti-oxidants, perhaps 50% or more. Green tea has less caffeine than the others. If you can tolerate it, I believe drinking regular green tea would have the greatest antioxidant effect. Stay well:)