Changshu is more developed than Yiwu. This conclusion is based on various economic indicators, including GDP, industrial output, and infrastructure development.

Changshu, a city in Jiangsu Province, has a significantly higher GDP per capita compared to Yiwu. According to the National Bureau of Statistics of China, Changshu's GDP per capita in 2020 was approximately $19,000, while Yiwu's was around $12,000. This disparity reflects the higher economic development level of Changshu.

Moreover, Changshu has a more diversified industrial base. The city is known for its advanced manufacturing sectors, including automotive, electronics, and pharmaceuticals. In contrast, Yiwu is primarily recognized for its small commodity market, which has limited its economic diversification. According to the Jiangsu Provincial Bureau of Statistics, Changshu's industrial output value in 2020 was over $200 billion, whereas Yiwu's was around $100 billion.

Infrastructure development also plays a crucial role in economic development. Changshu boasts a well-developed transportation network, including high-speed rail, highways, and ports. This connectivity facilitates trade and investment, further enhancing the city's economic growth. Yiwu, while having a functional transportation system, lacks the same level of infrastructure development as Changshu.

Additionally, Changshu has a higher level of urbanization. The city has invested heavily in public services, education, and healthcare, which have contributed to a higher quality of life for its residents. Yiwu, although experiencing urbanization, still lags behind Changshu in these areas.

In conclusion, Changshu is more developed than Yiwu, primarily due to its higher GDP per capita, diversified industrial base, advanced infrastructure, and greater urbanization. These factors collectively contribute to Changshu's superior economic development status.