I don't think there are ANY teas that have real anti oxidants in them. They may do when they are freshly picked, but by the time you get to put it into your cuppa, forget any effective levels.
The best anti oxidant on the market today is the Mannatech AO. It is a plant sourced anti oxidant, easily absorbed by the body, and is tested and proven to work (in blood serum tests).
So, my suggestion is, if you are after a truly EFFECTIVE anti oxidant, that will deliver benefits to your body, you can't do better.