The Alaska Airlines Visa Signature® Credit Card is the better choice for frequent Alaska Airlines travelers due to its higher rewards rate and more accessible credit requirements. It offers 3X miles on Alaska Airlines purchases and a companion fare annually.
The Citi® / AAdvantage® Platinum Select® World Elite Mastercard® is still worth considering for American Airlines loyalists. It offers 3X miles on AA purchases and two companion certificates after meeting a spending threshold.
Both cards waive foreign transaction fees, but the Alaska Airlines card is more accessible as it has a lower credit requirement.