The Citi Double Cash is a valuable workhorse among credit cards. With superior flat-rate cash back, it’s ideal for consumers who want low-hassle cash rewards.

Among American Airlines credit cards, the Citi® / AAdvantage® Executive World Elite Mastercard® is the most premium. It comes with the richest benefits — and the highest annual fee.

Most people keep a few credit cards in their wallet for their spending needs. Dave Grossman has an army’s worth at his ...