What are the differences between the political characteristics of the Northern Song Dynasty and the Southern Song Dynasty?

There were many famous soldiers in the Southern Song Dynasty, such as Yue Fei, Han Shizhong, Bi Zaiyu, Wu Lin, Wu Jun brothers, Liu Qi, and many traitors, such as Shi and Jia Sidao. Only half of them were in the Northern Song Dynasty.

There are many sages in the Northern Song Dynasty, including Han Qi, Fan Zhongyan, Kou Zhun, Sima Guang, Wang Anshi, Wen Yanbo, Lv Mengzheng and Zhao Pu, but there are not many famous people, only Yang Jiajiang and Di Qing.