Most expats have a need to move money between currencies and it makes sense to find a way to do this securely, easily and where you can save money. At the present time, it is important that you can do this without having to leave your home and, in view of recent issues with some UAE companies, with a currency broker with a good track record.
The online services offered by retail banks are rarely competitive and even if they do not charge a fee they make their profit on the poor rates of exchange offered. There is a better way with better value for money. Everyone wants to make savings so this is a better option.