Another major difference is the programming language used for automation. MetaTrader 4 uses MQL4, while MetaTrader 5 uses MQL5. MQL5 is more advanced and efficient, allowing developers to create more complex trading systems. However, this also means that scripts and EAs designed for MetaTrader 4 are not directly compatible with MetaTrader 5. For traders who already rely on specific MT4 tools, this could influence their choice.