There are several scenarios and reasons:
A. If you plan to hold a WCA competition, Cubing China is your only choice as the managing organization for all Chinese WCA competitions.
B. If you plan to hold a non-WCA competition, Cubing China is your best choice as the most professional information hub in China regarding of speedsolving competitions.
C. Cubing China is not only a place to announce your competition, but also a platform offers many convenient tools to make it easier for you to hold a speedsolving competition in China. More important, there are more tools to come in the near future.