I use the close but when the market is live whatever the software shows as the 10ema/20ema combination that has the least whipsaw moves. It was the best combination comparing it to the 9-18 or even the 5-20 which is also good. Whipsaws are the cause of losses and far outweigh speed of a signal. The 10ema/20ema was a good short term trend indicator when above or below as it is 2wks/4wks trend. Any of the shorter cross over trends of 4-9 or similar sized moving average combinations. were nothing more than noise and constant false cross overs. One can use the 10ema/20ema with intraday charts as well for short term trading. And watching to see price close each bar above the 4ema in a trend continuation is helpful.