ok, john mayer may have sold more copies, john mayer's lyrics may be a bit more edgy (who says being about drugs) etc. etc.
However, what's not being said here is that who says is a god awful song, absolutely piss poor, the lyrics do nothing to save it. Now i am actually a huge John mayer fan, i've bought battle studies and it is very good - but its simply not a patch on the circle. The Circle is exciting to listen to, Battle Studies is more of a relaxing album. The two are fairly different styles of music rendering them fairly incomparable in musical terms. To be honest i think is a poor choice to compare the two, it doesn't achieve much in my eyes other than saying they use different methods of promotion and John Mayer can sometimes be a mouthy git