30-min charts, because they give the best results in backtesting. Going down below 15-min intervals produce too many trades and significantly worse performance. 15 sec bars? Pure noise. Well, maybe a guy like bone can successfully scalp it...
Regarding stops. The best thing you can do is to backtest them on historical data. You'll see whether they will improve performance and what size of stops tend to work better. More important, backtesting can show you what indicators, set-ups, parameters, time frames, etc. give the best results and what drawdowns you should expect. You may backtest ES, NQ not only estx. If you want to trade discretionary not with a system, then it's a different story, but one thing still remains valid - don't trade too frequently.
Regarding stops. The best thing you can do is to backtest them on historical data. You'll see whether they will improve performance and what size of stops tend to work better. More important, backtesting can show you what indicators, set-ups, parameters, time frames, etc. give the best results and what drawdowns you should expect. You may backtest ES, NQ not only estx. If you want to trade discretionary not with a system, then it's a different story, but one thing still remains valid - don't trade too frequently.
I held the futures seldom longer than 1 hour... how do you avoid large losses in between the 30min-bars?