The main reason the M60 is recomended more often than the M50 is that the ratio of M60 to M50 owners is about 10 to 1.
The M60 is not "Better" than the M50, it is simply different.
Bottom line? Do you want an extreemly accurate speaker that will give you an unbiased representation of the recorded material-warts and all; one that may sound a bit too foreward, maybe a bit sibilant on some recordings, perhaps even a touch bright? "Brutally Honest" comes to mind for my understanding of the M60s presentation. Or would you prefer a sound that is a touch relaxed and more tollerant of less than ideal recordings? Do you enthusiastically listen to the music or do you critically listen to the speakers?
They're both great speakers, but for slightly different reasons. And while they both "sound" slightly different from each other, they both have that distinctive "Axiom" sound-whatever it is-and are in fact very closely related.
