I could be wrong here, but I'd hazard a guess that most of the proponents of 'A' grading tend to have done most of their aid climbing overseas, in particular Yosemite, whereas the defenders of the Ewbank 'M' system tend to do most of their aid climbing in Oz.
So I guess it all depends what you're used to. They both make sense to me.
I'll shut up now.
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