Oh, you mean the Original Amadeus? The wonderful? Better than the Versalex?
Now I remember...gee, it's all coming back to me...
The GTA has perhaps a tad more bass due to its material, that's all, and only slightly.
Oh, and a black ball.
The new Amadeus will have the Symmetrtex arm, or whatever the new stupid name is. It could be better, Firebaugh redesigned the pivot point. To improve tracking. Haven't compared yet. The new arm can be retrofitted to older models.