I prefer the 10, but I'm finding that the more I do this with free tools, the more "intuition" the 10-day MA seems to require... which is another word for "guessing". I think my preference for it was a transition.
As more and more of you guys use these tools, it's getting clearer that the 10-day MA is just too volatile. You have to be right on top of it. And with all the speaking and traveling Phil Town is doing, that just is too much trouble to be on it that tight. So I'm using the 30-day MA more and more as a RULE #1 Investor.