In terms of middle schools, Nanwai, the middle school affiliated to Heather University and Jinling Middle School, which rank in the top three in Jiangsu, have been very strong and are famous all over the country.
Suzhou Middle School in Suzhou seems to be quite famous.
Not to mention higher education, there are1321kloc-0/engineering colleges in Jiangsu province, of which 10 is all in Nanjing, including two 985 universities in Nantah and Dongda.
Suzhou has Suzhou University (2 1 1) and an undergraduate college, Suzhou University of Science and Technology.
Generally speaking, Nanjing is a big and atmospheric city and the ancient capital of the Six Dynasties. The cultural atmosphere and environment are incomparable in most parts of the country. In addition, Nanjing's urban character is more tolerant than Suzhou and Shanghai. Don't forget, Nanjing is the capital of education and fraternity.
In contrast, Suzhou looks a bit small and jasper.
Shanghai is very open and modern. Living in Shanghai and proper education can broaden your horizons, but it may also be narrower.