Cash back credit cards will always earn you the most relative to what you spend as far as rewards are concerned.  The standard rate for cash back reward programs is one percent, so $1 for every $100 spent.  Unlike point- or mileage-based rewards programs, with cash back rewards what you’ve earned is yours to keep and your rewards can’t be devalued in any way.  Another benefit of a cash back rewards program is that if you become unhappy with your credit card issuer and want to switch to a better credit card, you do not have to worry about losing your cash back.  You can simply request a check for your earned cash back rewards and then close your account at no risk.