First, I often use RED with MA's. Long Term Relative Strength charts and Breadth Charts, I use a 39 week, in RED.
Somtimes I use a 13 Week, as a rolling quarterly measure, and also a 65 Period, plus a 10, 20, 50, and 200.
For me no particular number holds trump over any other, but rather it depends on the utlity of the number, as a functional measure, rather than a "Holy Grail". None of these guys had a grip before gold turned, constantly said the same old wrong thing over and over, so whatever numbers they present, or measures, I'd be guided by your common sense, not someone postulations. Time spent on StockCharts, paid or free, IMO, is the best investment you can make. If you are of a mind to PM me, with a question or two, or request a mentoring consult.