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No. of Recommendations: 4
Maybe obvious, but one important feature will be no foreign transaction fees.
I would travel with one each Visa, MC, and Amex with that feature. Use one as a preferred card and the other two as back-ups in case a merchant doesn't accept one. It can be hard to find an Amex with no foreign transaction fee and no annual fee.

As for acceptance, using graphs from:
In 2018, Visa had more purchase volume than MC in Europe (60% vs. 36%), in the Middle East & Africa (58% vs. 38%), in Latin America (56% vs. 36%), in Canada (41% vs. 26%), and in the Asia-Pacific region (11% vs. 6%). UnionPay dwarfs both in the Asia-Pacific, with 80%. Amex is <7% in all of those regions.

MC may give a fractionally better exchange rate than Visa, according to this:

Capital One does not charge foreign transaction fees on any of their cards, I believe, and has several cards with current sign-up bonuses:

Barclaycard also offers several with no foreign transaction fees, with current sign-up bonuses:

And here's a list of some current cards with no foreign transaction fee:

Gotchas to look out for:
Note that even if a transaction is conducted in USD, a card may charge the foreign transaction fee if the merchant is based outside of the US.
Some merchants will offer to process your transaction in USD rather than local currency (known as Dynamic Currency Conversion). You should almost always turn this down, as their exchange rate is almost certainly worse than the one offered by your card.
And even if a card has no foreign transaction fee, it may still charge a cash advance fee if you use the card to withdraw foreign currency from an ATM or other source. Usually you can find a bank that will allow no-fee use of foreign ATMs (they just charge their current exchange rate on the currency), but that means you need a bank card in your wallet too.
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