Kunshan is generally considered better than Jiangyin in terms of economic growth and industrial development. Kunshan, located in the Yangtze River Delta region of China, has experienced rapid economic development over the past few decades. It has become a hub for high-tech industries, particularly in the electronics and automotive sectors. According to data from the Kunshan Statistics Bureau, the city's GDP reached 1.3 trillion yuan in 2020, reflecting its strong economic performance.

In contrast, Jiangyin, also in Jiangsu Province, has a more diversified economy, with significant contributions from the textile, chemical, and machinery industries. However, its economic growth rate has been slower compared to Kunshan. The Jiangyin Statistics Bureau reported a GDP of 540 billion yuan in 2020, which is lower than Kunshan's.

Several factors contribute to Kunshan's superior economic performance. Firstly, Kunshan has been actively attracting foreign investment, particularly from multinational corporations. This has led to the establishment of numerous high-tech enterprises in the city. For instance, Apple's main manufacturing facility in China is located in Kunshan. Secondly, the city has invested heavily in infrastructure, including transportation networks and industrial parks, which have facilitated the growth of its industrial sector.

Moreover, Kunshan's proximity to Shanghai, one of the world's largest cities, has provided it with a significant advantage. The city benefits from Shanghai's economic and technological resources, as well as its extensive market access. This has enabled Kunshan to become a key player in the global supply chain.

In conclusion, Kunshan is better than Jiangyin in terms of economic growth and industrial development. Its strong economic performance can be attributed to factors such as foreign investment, infrastructure development, and its strategic location in the Yangtze River Delta region.