There are so many different kinds of credit cards out there today, and it can be difficult to decide which one to apply for. So it's wise to carefully compare credit cards before selecting the one you wish to have in your wallet or purse. Here are eight categories on which to base your next credit card decision.Card type. Check to make sure whether you are applying for a Visa, MasterCard, Discover, or American Express card. This sounds intuitive, but you'd be surprised how ...