The card's rewards structure isn't the easiest to remember. But its useful bonus categories, flexible rewards and outstanding welcome offer make it a top contender among cash-back cards.

You'll earn 6% back at U.S. supermarkets on up to $6,000 a year in spending, plus 6% back on select U.S. streaming services and 3% back at U.S. gas stations and eligible transit. Terms apply. The ...