As a tradeoff you may have to pay a higher annual fee. Keep in mind that credit card issuers may change their interest rate at any time. They only must notify you in writing of their intentions to do so. Always check if a low rate is part of an introductory offer. If so, issuers may raise the rates considerably after the introductory period.
Some cards use a variable rate system.
With these cards your interest rate can change from month to month with no notice. In this case, the interest rate is not a factor because your account won't accrue interest. This means you will be charged interest from the moment of purchase. There are many other factors involved in choosing a credit card. Some cards offer annual cash back programs, free insurance on rental vehicles, or some other incentive for you to use their card.