With Instant execution your order will be executed at the requested price or you will receive a requote.
With Market execution your order will be executed at the available market price at the time, at VWAP (Volume Weighted Average Price)
We offer MT4, MT5 and cTrader accounts with Market execution, and MT4 and MT4 Fixed Spread accounts with Instant execution.
You can find more information about order execution on our website:https://www.fxpro.com/mt4-order-executionPlease note that for pending orders the execution is the same regardless of account type (i.e. all stop orders are executed with 'market execution' and all limit orders are executed with 'limit execution').