"The Goji belt produces four grades of Goji berries: super, king, special and Grade A. The largest berries are “super,” second largest are “king,” etc. You might find marketers advertising their berries as the biggest, but they’re still all the same berry, Lycium barbarum. They’re that unless, of course, they’re Lycium chinensis."
It's good to have a mix of at at least two kinds of Goji berry plants for pollination from what I understand. Other useful ilnfo...
http://www.polkaraspberry.com/...