Curry 5 vs Kelly MC
The Kelly MC has a wider cup diameter, the Kelly MC features a deeper cup, the Curry 5 has a larger throat opening.
Cup Diameter
The Kelly MC has a cup diameter of 16.76 mm / 0.6598 in compared to 16.51 mm / 0.6500 in on the Curry 5 — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Kelly MC has a very deep cup while the Curry 5 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Curry 5 has a wider throat (4.50 mm / 0.1770 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 5 is described as unspecified, and the Kelly MC 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.