Fresh fruits are some of nature’s most powerful antioxidants. The top ten list is at right, taken from the USDA data base on the ORAC value of fruits. We included here only whole fruit, not dried fruits or juices. These measures are by weight and it becomes difficult to compare dried and fresh fruit: a raisin will have a higher value by weight than its grape counterpart because the raisin has had its water removed. Juices are difficult too if you do not account for water differences.
There are berries that would be on this top ten list, notably acai berry, but we do not have data for fresh, whole acai berry.
We should also note that processed fruit does contain antioxidants. Fresh is always best but frozen, cooked, powdered, and dried fruit will contribute to an antioxidant-rich diet.