Similar to Kotak Mahindra Bank, HDFC Bank also offers co-branded cards with IndiGo airlines, as 6E Rewards and premium ‘6E Rewards XL’ variants. The base and premium variants from both issuers offer largely identical benefits. To choose between these cards, you can either go with your preferred issuer—HDFC or Kotak—or you can make a value-back comparison. For instance, in comparison to the 6E Rewards XL IndiGo HDFC Bank Credit Card, the Kotak IndiGo XL offers a slightly higher return of up to 6% in comparison to the 5% offered by HDFC. However, HDFC’s premium IndiGo variant has an edge due to a comparatively lower forex markup fee of 2.5%. Thus, you must decide what benefits suit your spend types better.