Giardinelli C10 vs Marcinkiewicz CH 15S
The Giardinelli C10 has a wider cup diameter, the Giardinelli C10 has a larger throat opening.
Cup Diameter
The Giardinelli C10 has a cup diameter of 17.50 mm / 0.6890 in compared to 17.42 mm / 0.6858 in on the Marcinkiewicz CH 15S — a difference of 0.08 mm / 0.0031 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 Giardinelli C10 has a wider throat (4.90 mm / 0.1929 in vs 4.57 mm / 0.1799 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.