The below came from another thread and caught my attention, as it contrasts discretionary and systematic approach to the markets. I have done both and was reasonably good at both. There are advantages to both approaches and disadvantages to both, in my view and it would be very interesting to discuss why you decided on a particular approach. Over the years I have gradually transitioned from a more discretionary approach to a more systematic one. - The main reason was that you can automate things and thus have a number of market positions working concurrently. - Also, it's nice not to waste mental energy on decisions that can be performed by an algorithm. - There is also a lifestyle advantage to systematic trading once you get it rolling, you can take a day off and trading does not stop - Last but not least, there are strategies that can only work in a systematic manner, either because of the sheer number of assets or because of the required speed PS.Let's not turn this into a quant or no-quant discussion, there are people doing discretionary quant trading and there are people doing systematic non-quantitive trading.