Bach 2½C vs Curry 3 BBC.
The Curry 3 BBC. has a wider cup diameter, the Curry 3 BBC. features a deeper cup, the Curry 3 BBC. has a larger throat opening.
Cup Diameter
The Curry 3 BBC. has a cup diameter of 16.89 mm / 0.6650 in compared to 16.40 mm / 0.6457 in on the Bach 2½C — a difference of 0.49 mm / 0.0193 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Curry 3 BBC. has a very deep cup while the Bach 2½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Curry 3 BBC. has a wider throat (4.06 mm / 0.1600 in vs 3.66 mm / 0.1441 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.