The Delta SkyMiles® Platinum American Express Card is the better choice if you’re indifferent between Delta and American Airlines. It offers a higher rewards rate on airline fare purchases and a valuable companion certificate. However, the Citi® / AAdvantage® Platinum Select® World Elite Mastercard® is recommended for American Airlines loyalists, especially with its annual fee waived for the first year.
Both cards provide airline-specific perks like free checked bags and priority boarding, but the Delta card has broader accessibility and superior rewards.