The currency exchange place literally across the street from the airport will have significantly better rates.

Most places display FX rates on a board in front of or inside their stall, so it’s really easy to see the different rates; I have never exchanged money at an airport and got a better deal than outside of the airport. It can be a significant difference, like 20% less in the airport.

There are currency exchange windows in every country and city and you will be able to get a higher rate at those.

If you need to exchange $10 cash to get into the city, go for it, but wait to exchange the rest until you’re outside of the airport.