Hi Sebastian,
We use the free Historical Data app, or Premium Data (DukasCopy) or Metatrader (JFD) data, as you correctly say. This is because they offer us the most amount of bars in the historical data. But this doesn’t mean that these are necessarily the best brokers to trade with. That is why, in EA Studio setting, there is the Symbol Settings option. This is where we can customise the asset according to the specifications of our chosen broker. In this way, we have a huge amount of historical data available to us, and we can cutomise it to be suitable for any broker of our choice.
Thanks,
Ilan