Curry 60M vs Kelly 5C
the Kelly 5C features a deeper cup, the Kelly 5C has a larger throat opening.
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 16.76 mm / 0.6600 in.
Cup Depth
The Kelly 5C has a very deep cup while the Curry 60M has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Kelly 5C has a wider throat (3.80 mm / 0.1496 in vs 3.66 mm / 0.1440 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Material
The Curry 60M 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.