I use a variety of MA periods when looking at basic charts.
What I have been tending to do is use a simple 2-line MA200 if looking at a 1-5 year chart; but both a 30 and 200 MA if looking at 1-2 month chart.
A question however: If I am looking at a SP over a relatively short period, say 1-2 months, is there a "preferable" MA setting? ie: Which is associated with greater significance? eg: As to when the MA is crossed by the SP?