Quote from romik:
I think trading a proven system is a lot less stressful in comparison to discretionary trading, unless one is really disciplined. Whenever I used to make trade decisions based on what my intuition used to tell me including indicators and market analyses, it was bloody hard to close a loser. Too much bias present.
Quote from LondonUSTrader:
Most successful intraday emini discretionary traders are trading a proven system. That is to say, a method that has rules, but usually requires a degree of judgement as well.
Discretionary trading does not necessary mean discretionary traders are trading by gut feel alone.