Dual-currency card refers to a credit card with both RMB account and foreign currency account. Generally, the "UnionPay" logo is affixed to the upper right corner of the front of the card, and the logo of VISA, JCB or MasterCard is affixed to the lower right corner.
The main function of all currencies is to exempt currency conversion fees and handle the transaction needs of all currencies. No matter where you spend money, you can repay it directly in RMB after returning home, and you can also avoid the formalities of purchasing foreign exchange.
From this comparison, we can easily see that the all-currency card is slightly better, which can avoid the trouble of settlement, and also contains more currencies, so that cardholders can easily spend in various countries.