You might look for the lowest interest rate when choosing the best credit card. While the lower rate of interest may be essential for you, it would not be wrong to suggest that you should consider several other aspects before choosing the right credit card for you.
If you were paying your credit balance every month and do not carry balance forward, the interest rate carried by your card would not concern you in any manner. However, you may be concerned with the grace period. Paying your balance every month and within the grace period would enable you to use the card for several years without paying the interest.