It depends on many factors. Exchange offices are not all equal, as not all banks are all equal. Their currency rates are very different. Many banks are unfavorable for charging commission for changing currency, which makes them worse from exchange offices. Or they can offer a better rate, but only if you have an account with them and leave the money in the account for example 15 days. Generally, there are no rules that apply to all. We invite you to check all possibilities before changing the currency. On our website under "links" you can find links to the exchange rate of some banks.