When you travel in Europe or the United States, a card in euros or US dollars is recommended. If you directly apply for a card in the desired currency, it will be considerably cheaper. When you withdraw money at a foreign ATM or make a purchase abroad, you will not have to choose your currency and be charged exchange fees. Also, you have a better overview if the currency of your card coincides with the local currency of your destination. When you travel outside Europe or the United States, a card in Swiss francs is advised.