Denis Wick 2.5CC vs Giardinelli 18
The Denis Wick 2.5CC has a wider cup diameter, the Denis Wick 2.5CC has a larger throat opening.
Cup Diameter
The Denis Wick 2.5CC has a cup diameter of 32.00 mm / 1.2598 in compared to 31.00 mm / 1.2205 in on the Giardinelli 18 — a difference of 1.00 mm / 0.0394 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Denis Wick 2.5CC has a wider throat (8.60 mm / 0.3386 in vs 7.95 mm / 0.3130 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.