Which is more developed, Fujian or Haikou?

I estimate Hainan! The reason is that Hainan implements the capital economy and is a special economic zone like Shenzhen. The state's support is also relatively strong. However, Fujian is only a coastal province, and Taiwan Province Province is on the other side. For national defense reasons, the state will not give Fujian much support. Even large state-owned enterprises and military enterprises rarely enter Fujian.