The exchange rate will always be lowest in the country but you should always take a lite bit of cash if you arrive late at night. Normally it is very easy to find an ATM at the airport and that will safe you money but some airports close early and it might be difficult to find the ATM without the Service Center being open.
Never allow the ATM to convert the amount to your home currency, they will always use a worth exchange rate.
Also take the time to ask your bank at home if there is an ATM where you can get cash without paying transaction fees.
When traveling it is always good to get familiar with the customs of the ATM Systems of the country. Some of them give you first the money and afterwards your card, others give you your card first. Some are time limited, if you don't take the cash within the minute they will stop the operation and take the cash and the card for security reasons. Others only take cards with a chip and not a magnetic strip, unfortunately the error message will not always be translated correctly.
Also check the ATM for movable components, if the card entrance looks to be tempered with, do not use it. It got too easy to copy a credit card and the hassle to get that straightened out afterward is unpleasant.
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