Up to 2% cash back: Among personal credit cards, the Citi® Double Cash Card has the highest potential flat rate for cash back. “Potential" is the operative word here, because you receive 1% cash back when you make a purchase, then receive the other 1% when you pay the bill by its due date (you just need to make the minimum payment). If you pay late, you lose the second half of your cash back. It's an interesting quirk that obviously can be annoying if you slip up, but it does motivate you to pay your bill on time.
0% intro APR on balance transfers: The Citi® Double Cash Card has one of the longest 0% intro APR offers for balance transfers, as that rate lasts for 18 months. Even though there's a 3% ($5 min.) balance transfer fee, this card remains a smart choice for consolidating all your debt with a balance transfer credit card. Once you do, you'll have those 18 months to pay it off without incurring any more interest. By the way, you don't earn any cash back on balance transfers, which is a standard term of cash-back cards.
No annual fee: Many cash back cards have no annual fee, so this isn't a big advantage for this card. But it's still nice for your budget when you don't have to pay anything for your credit card.
Multiple cash-back redemption options: You can use your cash back for a statement credit or request it as a check, and the redemption minimum for both methods is $25. You can also have your cash back deposited in either a Citi bank account or any checking account that you've used at least two times to pay your Citi credit card bill. With deposits, there's no redemption minimum.