Which is more powerful, Jiuyin Zhen Jing's mental method or Jianghu internal skill?

Compared with Jianghu internal skill, Jiuyin Zhen Jing has a better knowledge of skills. According to relevant data, in Jin Yong's martial arts novels, Zhen Jing's bosom friend skill of Jiuyin is more powerful than Jianghu's internal skill, and it can kill people invisibly.