Among the four major banks with the most credit card activity, China Merchants Bank, Bank of Communications and China CITIC Bank have the most activity.

1. China Merchants Bank credit card offers many discounts, good service, convenient operation and high security.

2. Bank of Communications credit card activities are user-friendly and practical. No points are required, and cash is returned directly.

3. China CITIC Bank Credit Card is comparable to China Merchants Bank in terms of credit card business, and many activities are very innovative.