I have almost finished coding my first EA and exited about doing a proper backtesting soon. At first I thought I would use the data available in history center, but then this thread (link below) suggested to download data from dukascopy instead? What are you guys' opinion on this? Is the data in history center provided by my broker or through Metatrader? I am with Oanda and can't really say if they provide quality data... My strategy is meant to be applied to 5min chart on EURUSD.
I guess what I am asking is: what is the best quality of data for backtesting in your opinion?