Which is better to take children to Hainan or Shanghai in winter vacation?

Is it more appropriate to take children to Hainan and Shanghai in winter vacation? Hainan. According to the inquiry, official website, the Hainan Provincial People's Government, and official website, the Shanghai Municipal People's Government,

1. Climate: Hainan is warm in winter vacation, with four seasons like spring, while Shanghai is cold and snowy in winter vacation.

2. Development direction: Hainan focuses on tourism service industry, and accelerates the construction of modern service industries such as tourism and shopping in the process of building a free trade port. Shanghai is dominated by high-tech industries, and the development trend is still high-tech. Hainan is more suitable for traveling than Shanghai.