Hi! May I know which cards would you recommend for miles / cashback when using in the states? Or shld I just stick to Youtrip for better exchange rates actually? (Or use Trust card is better?)

I use trust most of the times

Youtrip and trust is more than enough :)

Youtrip, trust and even amaze might be a good choice.

Youtrip would be better as the exchange rate is good and no additional admin cost.

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While using credit cards for foreign country expenses will earn you miles, go calculate how much additional admin fees and exchange fees that may cost you, and convert it to miles per dollar earn, it should be not worth at all. Cash is more value than miles because miles can devalue anytime.