Curry 1.5 DC vs Kelly 5C
The Curry 1.5 DC has a wider cup diameter, the Curry 1.5 DC has a larger throat opening.
Cup Diameter
The Curry 1.5 DC has a cup diameter of 17.02 mm / 0.6700 in compared to 16.76 mm / 0.6598 in on the Kelly 5C — a difference of 0.26 mm / 0.0102 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 1.5 DC has a wider throat (3.81 mm / 0.1500 in vs 3.80 mm / 0.1496 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Material
The Curry 1.5 DC is described as unspecified, and the Kelly 5C as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.
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.