Exponential Moving Averages

Any thoughts on using 252EMA? Since there are 252 trading days in a year averaging wouldn’t that be more true to charting long-term. I’ve learned 200 which is the go-to, but I’ve come across a few use 252 when charting and the only reasoning why they say is 252 trading days in a year.

Adding to that, 50EMA is most common, but 63EMA represents 3months, wouldn’t that be more useful since all trading charts use 3mo

Any insights appreciated ??