My friend, who is willing to visit Indonesia, went to a Russian bank to get a debit card.
The manager advised him to go with MasterCard rather than Visa, because "Visa would first convert rubles to U.S. dollars then to rupiahs, and MasterCard would do a direct exchange".
This is not what I heard about how the cards work, still, that's what a bank person says.
Is there something behind this statement?