In answer to the original poster, I am discretionary and, yes, I do make a few cents out of this game...
I tried the emini index futures, and couldn't make em work for me (too noisey and too many fakeouts)... I tried equity options, and found that there were too many variables to consider for my little brain... I have never been net profitable with emini index futures or with options... But I have generally been net profitable with stocks...
So I stick with what turned my grubstake into a workable account back in the bubble days: STOCKS... I am intraday primarily, these days, though I am not averse to swing trading... I sometimes carry overnighters particularly if my gut tells me the move has legs...
I enter on both intraday breakouts and on reactions, depending on my gut feel i.e. I am discretionary trader...
I try and keep risk in check, 0.25%-0.5% of my account on a single trade these days... I sometimes have profit targets, I sometimes trail stops: it again depends on my gut feel...
I have rules on risk, but I occasionally break em e.g. if my gut tells me that the trade is a biggie, I sometimes risk more of my account e.g. 1%-2%...
Depending on the friendliness of the market and the strategy being used, my hit rate can be anything from 40% to 70%... my reward:risk ratio ranges from 1:1 to 'large':1, where large can be 50... if I get a 'large' it's generally cos I got lucky in a position trading trend (after having entered as a daytrade, deciding to carry overnight and then deciding to position trade it as an afterthought) and was relaxed enough not to bail for a 'rational' profit target... I may get one 'large' trade a year... 'large' trades are nice if I was aggressive (or arrogant) enough to have position sized at 1%+

... the more I trust my gut, the less stressed out I feel about everything... to delegate the entry and exit decision to a rigid trading system would drive me nuts...
For me, trading is artistry, discipline and a bit luck... it ain't really a science... I believe my gut contains information that computers and their scientific trading systems can't contain (but I ain't quite sure what it is)...