Dear Liz: My wife and I have had our bank’s airline cards a long time, but we want to change because it’s become almost impossible to cash in the miles. What I don’t see in various card-comparison articles are ratings of the card issuers for customer service and fraud protection. Our bank has been quite good at both, but what about the other issuers?

Answer: People are often unduly impressed when their credit card issuers contact them frequently about possibly fraudulent charges. The issuers are the only ones at risk in these situations, since under “zero liability” policies you can’t be held responsible for bogus charges. Also, if their software were better, they might do a better job of separating legitimate from fraudulent transactions and have to bother you less.

In any case, it’s tough to tell as a customer how good the issuer’s fraud prevention measures are. So perhaps a better metric to use is customer service, and J.D. Power publishes an annual credit card satisfaction study that tries to gauge six factors: interaction; credit card terms; billing and payment; rewards; benefits and services; and problem resolution. American Express has ranked at the top of the survey every year since it started seven years ago. Discover ranked second for 2013 and Chase ranked third.