The Southwest Rapid Rewards® Premier Credit Card and the United℠ Explorer Card are excellent choices for frequent flyers, offering valuable airline-specific perks. The Rapid Rewards Premier Card is better, providing three points on Southwest purchases and a generous welcome bonus, plus 6,000 anniversary points annually.
However, the United Explorer Card is worth considering for its free checked bags and Global Entry or TSA PreCheck fee credit, making it appealing to United Airlines travelers.