Quote from bitrend:
If discretionary has advantage over mechanical why should the first trader use 80% rule-based, why he's not just using 100% intuition? Most successful traders didn't exclusively use intuition, they had their system (rule-based) for at least a certain percentage. They can't win without a good trading system. While second trader can go fully with rule-based, no intuition. It looks like rule-based sound better if we compare between 100% rule-based and 100% intuition, excluding the mix.
Rule-based can go without intuition, while intuition cannot go without rule-based.