Which city, Shanghai, Nanjing or Hangzhou, has the strongest sense of identity among Suzhou and Wuxi people?

Definitely Shanghai. Nanjing is the Mandarin area of ??Jianghuai, and the customs and habits of Nanjing people are the same as those of northern Jiangsu and Anhui. Nanjing is called Huijing by ordinary people in Suzhou and Wuxi. Hangzhou has become a semi-mandarin area after the Jingkang Revolution in the Northern Song Dynasty. Hangzhou dialect is obviously different from the surrounding Wu dialect in northern Zhejiang. Shanghai is a standard Wu-speaking city. Shanghainese people belong to the Wu-Yue ethnic group. Before liberation, there were many Su, Wu and Chang people who immigrated to Shanghai. People in Shanghai and ordinary people in Suzhou and Xi have the same customs and similar dialects. They are both cities that advocate Wu style and Wu customs. This is called the identification of the Wu-Yue ethnic group.