Editorial take: Citi Double Cash
The OG flat 2% card. The cash back is paid as ThankYou Points, and those points transfer directly to Citi's airline and hotel partners at 0.7 of the premium ratio (1,000 points = 700 miles at most partners); moving them onto a Citi Strata Premier or Strata Elite account gets the printed ratios, 1:1 at most partners. Rock solid for non-bonus spend.
