Here are some key differences:
1) DVDs are set in stone. Once you release content, whatever is on it is on it for good. Therefore, it is very difficult to update or change curriculum.
2) DVDs are a one-time only sale, whereas through Warrior’s Archive Pro, you can offer a monthly subscription, thus creating passive income for your ever-improving material.
3) Perhaps the most important difference is the ability to control access to content by rank. You might want your Green belts to see one thing and your Blue belts to see another.