What is the best EMA strategy for intraday and swing trading?

Has anyone does EMA crossover backrest? Any idea which of the below is best strategy for intraday and swing trading?

9 crossover 21
9 crossover 55
21 crossover 55
5 crossover 20
50 crossover 200

I don’t think so there is any best combo. You need choose the one as per your trading need. Backtest them and the decide

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