if using EMA what length do you find that works really well ?
EMA is a very useful tool but only for indicating the direction and strength of a trend. Only.
So, how good a given length is depends on your strategy. e.g. try using an EMA with a duration 4, 5 or 6 times longer than the expected duration of your trend-following trades.
Don’t use EMA’s for reversal trade signals.
60-day average movement.
200-day average movement.