Imagine that System A has seventy percent winning trades, making thirty pips profit on the wins and losing forty pips on the losses. System B has 40% winning trades, seventy pips up on the wins and thirty pips down on the losses.
System B will make a touch more profit in the long term, but it will generally have runs of many losses in a row. This can be extremely hard to handle psychologically and might end up in the trader losing trust in the system and giving up when he was down.
On the other hand it could also be hard to cope with systems that have huge single losses. Does It Fit My Trading Style?
Forex traders hunting for day-trading systems have different wants than long term traders. You’ll need to think about what times you’re able to be online and trading. If you only have a small window of time when you can trade, you may need a system that works very well for a specific currency pair that’s active at that time. There could be many factors like this to take into account when considering currency exchange day trading techniques dependent on your situation.