Originally Posted by
cbn42
The exchange rates are set by the network (Visa, Mastercard, Amex, or Discover), not the issuer. Visa and Mastercard post their rates online, and they are essentially the same. The others might be different. If you want more accurate results, compare a no-forex fee Visa to a forex-fee Visa.
Agreed. Sometimes the networks can be massively different. I often find that my Amex is better when spending in US dollars (My card is in Pounds) even with the fee than my MasterCard that has no fees.