Baduanjin is an ancient routine, which originated from China's TCM health preserving theory. Its movements are relatively simple and easy to practice. This set of boxing attaches importance to adjusting breathing and has a good effect on improving breathing problems. Its movements are slow and steady, suitable for middle-aged and elderly people to practice.
Twelve Duan Jin is a relatively new routine, which originated from modern Wushu. Its movements are complicated and it is difficult to practice. It emphasizes the coordination of all parts of the body, and its effect on improving physical fitness is better than that of Baduanjin. This kind of boxing is fast and powerful, suitable for young people to practice.
Ba Duan Jin attaches great importance to the harmony of human internal organs in theory, and his movements and breathing are designed from the perspective of traditional Chinese medicine. On the other hand, Twelve Duan Brocade pays attention to the coordination of physical and strength training, and the movements and breathing are designed from the perspective of modern sports science.
To sum up, Baduanjin and Shiduanjin are different in action and theory. You can choose your own routines to practice according to your own needs.