Yongzhou is more developed than Yingtan. This conclusion is based on several key indicators of economic and infrastructural development. Yongzhou, as the capital city of Hunan Province, has a larger GDP, more extensive transportation networks, and a more diversified industrial base compared to Yingtan.

Data from the National Bureau of Statistics of China reveals that Yongzhou's GDP in 2020 was approximately 130 billion yuan, significantly higher than Yingtan's GDP of around 80 billion yuan. This economic disparity is a clear indicator of Yongzhou's greater development. Additionally, Yongzhou has a more robust transportation infrastructure, with a high-speed railway station and an international airport, facilitating both domestic and international travel. Yingtan, on the other hand, lacks such advanced transportation facilities.

Furthermore, Yongzhou boasts a more diverse industrial sector, including manufacturing, mining, and agriculture. The city is home to several large-scale industrial parks and has attracted significant foreign investment. Yingtan, while having some industrial development, does not have the same level of economic diversification or investment attraction as Yongzhou.

In terms of urban development, Yongzhou has a more extensive urban area, with better residential, commercial, and recreational facilities. Yingtan, while growing, still lags behind in terms of urban amenities and infrastructure. This is evident in the higher quality of life and higher property values in Yongzhou compared to Yingtan.

In summary, Yongzhou's economic strength, transportation infrastructure, industrial diversity, and urban development make it more developed than Yingtan.