Denis Wick 1 vs Kelly 25
The Denis Wick 1 has a wider cup diameter, the Denis Wick 1 features a deeper cup.
Cup Diameter
The Denis Wick 1 has a cup diameter of 32.50 mm / 1.2795 in compared to 30.99 mm / 1.2201 in on the Kelly 25 — a difference of 1.51 mm / 0.0594 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Denis Wick 1 has a very deep cup while the Kelly 25 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Denis Wick 1 is described as unspecified, and the Kelly 25 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.