According to NerdWallet Mastercard gives the best currency conversion rates globally, giving better rates 70% of the time. This includes the major traded currencies such as the US dollar, Euro, Great British Pound, Australian dollar, Japanese yen, Hong Kong dollars, Canadian dollars, Singapore dollars, Swiss francs and New Zealand dollars. However Visa does give better currency conversion rate for Thai baht, Hungarian forint, Icelandic Krona and Tunisian dinar.
Should I use a Mastercard or Visa to travel overseas?
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