Bach 1 vs Curry 1.25 DC
The Bach 1 has a wider cup diameter, the Curry 1.25 DC has a larger throat opening.
Cup Diameter
The Bach 1 has a cup diameter of 17.50 mm / 0.6890 in compared to 17.07 mm / 0.6720 in on the Curry 1.25 DC — a difference of 0.43 mm / 0.0170 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Curry 1.25 DC has a wider throat (3.81 mm / 0.1500 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.