The antioxidant hypothesis fell through. As far as I know, no one has been able to demonstrate antioxidants do anything for us.
Green tea does have components that help our health but they are not antioxidants.
I’m not sure about Guarana’s components. But I wouldn’t consider the antioxidants in each as a deciding factor for which one to consume to improve my nutrition.
Green tea is crap. Matcha is where it’s at! Matcha contains 137x more catechins than green tea! If you want maximum antioxidants, look into a supplement called Astaxanthin. It has more antioxidants than nearly anything else on earth. While blueberries antioxidant value is 6,000 , Astaxanthins is nearly 3 million. Lots of amazing benefits. Including anti aging. It can be used topically too. Which I do. Too many benefits to list