I really like my American Express Rewards credit card. It's just so great knowing that after I pay my bill in full every month I am getting a little bit back. It feels like I'm shopping with coupons all the time without the hassle of clipping them.
I think it's such a great credit card that whenever someone asks me which one I recommend I usually show them that card and all the features it has, like a low interest rate mine is only 9.99%, when you first apply for one you get twelve months interest free, and the cash back rewards.
I've had many different credit cards before, but currently my AMEX is my favorite by far!