2. which is more economical, visa, MasterCard or American Express? It depends on your bank card. Some banks are the same, and some banks are different. General currency exchange fee 1.5% (minimum 1%, maximum 1.75%). You can call the customer service of the credit card center to find out.
Third, the exchange rates have not been compared, and they are estimated to be similar. If the handling fee is the same, UnionPay may be the worst.