Yijinjing is a martial art in Shaolin Temple, which requires a high level of learning. In Tianlong Babu, we can see that only Zhuang Juxian has studied it. Yijinjing is a martial art in Shaolin Temple. As long as people exist, they can keep practicing even when they are asleep, which shows the horror of Yijinjing. If Zhuang Juxian hadn't died at that time, he would have become a martial arts master in a few years, but Yi Jinjing was also a master.
What we know best about Jiuyang Shen Gong is Zhang Wuji's Jiuyang Shen Gong. Jiuyang Shen Gong can achieve endless results by deciphering the human body itself and squeezing its potential. Therefore, the reason why Zhang Wuji can become a master in "Eternal Dragon Slayer" is probably because of the resilience provided by Jiuyang Shen Gong to Zhang Wuji, but Jiuyang Shen Gong also has its own shortcomings. Because Jiuyang Shen Gong is squeezing the human body, it will eventually bring a burden to the human body, thus endangering the human body.
Comparing the two martial arts, we can see that both martial arts are martial arts stunts, and both can be king in one field. If you practice one of them well, you can become a martial arts expert, so if you compare Yijinjing with Jiuyang Shen Gong, I think it can compete.