Best International Credit Card?

I always used visa or MasterCard in Europe, but there were some tricks to learn at first. You could use Amex but it wasn't accepted everywhere like the others.

From what I remember my Australian friends saying, they don't have the fancy chipped cards there

Some tips from my travels
You can't get gas in Germany without a chipped card. You can buy a chipped travelex/forex card from those thieves in the airport, but I refused to do that. I just filled up in Denmark or Netherlands before driving through Germany. Or carried cash.

I had to tell a lot of places it's an American card and to manually swipe, they treated it like a chipped card usually.

Some US companies are starting to offer chipped cards now which is great, but I'm not traveling at all anymore.

Find a card that doesn't charge foreign transaction fee's. Try USAA, smaller credit unions, smaller banks. All my major company (bank of america, chase, etc) cards charged a % fee but the local bank I had at the time did not.

Good luck opening a local bank account too, had lots of American friends that couldn't open accounts bc the local banks hated the reporting requirements for US treasury/IRS. If they could get an account they usually had to get a local friend to co-sign on the acct with them.