You fly Delta because it's what leaves from your airport, and roughly $400 a month goes to airfare. The obvious move is a SkyMiles co-brand — but co-brand cards mostly pay 2x in a currency only Delta prices, and we don't rank cards we can't honestly value. So here's the question our data CAN answer: of the cards we track, what should a Delta loyalist actually carry?
The answer splits in two, and the split is the interesting part. The card that earns the most on this profile can never send a point to Delta. The card that CAN feed SkyMiles — Amex Gold, whose Membership Rewards transfer to Delta 1:1 — gives up about $50 a year to the earn winner. Which side of that $50 you take depends on whether every point you earn is secretly a Delta award in waiting.
Key insight
Citi Strata Premier wins the raw math at ~$731/yr net — 3x on flights, hotels, dining, and groceries for a $95 fee — but ThankYou points transfer to Turkish, Air France, and Avianca, never to Delta. Amex Gold is the only top-five card whose points reach SkyMiles (Membership Rewards transfers 1:1): 4x on dining and groceries plus 3x on flights, netting ~$681/yr after its full $325 fee. That makes the decision a clean $50/yr question: take Strata's bigger pile of non-Delta points (Turkish miles book Star Alliance awards, not Delta), or pay ~$50/yr less earnings for Gold's direct pipe into the program you actually redeem in. If you'd answer "every point I earn is a future Delta ticket," Gold is your card despite ranking third.