If you can spend 20k every month and has eligibility criteria - SC Ultimate
They charge 4.13% - refund cashback of 1.5% + reward rate 3.33% = 0.67% return.
Intl. Lounge: 1 per month if previous month 20k
Eterna:
Forex fee 2.36% - reward rate 3.75% = 1.4%
Intl. Lounge: 0
Other options: DCB, IndusInd Vistara, Regalia, AU Zenith
Elite: Not worth interms of rewards, IMO.
Forex Fee: 2.36% - reward rate 0.5% = -1.8%