Your credit card company (be sure you have a card without foreign transaction fees) has to give you the best rate available at the time of the transaction. Because of this, it's always best to use a credit card. I don't know if you are in the states or not, but if so, I have found that the Venture card by Capitol One is a good travel card b/c of no foreign transaction fees. Of course, I think more and more are getting on the band wagon. I also believe they have finally came out with a chip card, which will make travel for US citizens easier, too. I know my Citi card finally did, which while I didn't have any problems with my swipe card in 2014, the chip would have made life easier in Paris and Iceland, especially.