You mentioned that both of them have been engaged in public examination training for many years, and the mention rate is relatively high. It should be said that they have been so loud for so many years, and they all have certain contents. It is not a problem which one you choose to apply for, but the teachers of Zhonggong are stronger and the quality of books will be much better. They must have summed up something. You can learn from any of them. The advantage of signing up for the training class is that you can temporarily accept some test rules summarized by others, which can help you solve problems, but many things that need to be accumulated at ordinary times cannot play a completely new role. You can apply, but you can't pin your hopes on it. I hope it helps you.

If in doubt, please consult the public education enterprises in China.