I have both cartridges: Audio Technica AT33PTG (mounted on a SME 3009, Garrard 301) and Clearaudio Maestro (mounted on a Morch DP-6, Thorens TD-124). Before letting them staying permanently with their matches, I have switched them around a bit, and found that both of them are excellent cartridges. The AT33PTG is a tad smoother, sweeter, more intimate sounding, and the Maestro is fuller body, more powerful in the bass, offer a bit wider and deeper soundstage. Both of them are excellent trackers, also. They are equal in resolution/detail retrieval, with the Maestro offers more solid bass punch, while the AT33PTG is a tad more refine/smoother on high frequencies.
This is my own impression about them. Hope it helps.
This is my own impression about them. Hope it helps.