CH4 is the most suitable, the most cost-effective.
At this level, CH4 is the best choice, with the most appropriate price, the most mature technology and the most functional modules.It was developed by an enterprise affiliated to China Aerospace Science and Technology Group,Have a good data link
The better one is of course the CH5, which is farther, bigger, has more bombs, but one can buy a lot of CH4s.
Just like a ballistic missile with a 10000 km, and another range of 3,000 km, it depends on the needs of the country.