What do you think are the differences, advantages or disadvantages of practicing one over the other?

The primary Qigong we have learned in the class, Qigong Shibashi, is based upon Yang Tai Chi. What do you think are the differences, advantages or disadvantages of practicing one over the other? That is, do you think there is value gained or lost by practicing a tai chi based qigong opposed to practicing tai chi itself. helpful online article “The Man Who Invented Qigong” at www.qigonginstitute.org/docs/The%20Man%20Who%20Invented%20Qigong-1.pdf (this must be typed exactly including upper case). If you have trouble searching title in Google. Here is a video of the full Shibashi set 1 https://www.youtube.com/watch?v=aAwbJ9MO91I#action=share