Marcinkiewicz 15 vs Monette Cornet BP3 FL
the Marcinkiewicz 15 has a larger throat opening.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Marcinkiewicz 15
• Cornet
Cup depthDeep
vs
Mouthpiece B
Monette Cornet BP3 FL
• Cornet
Cup depthDeep
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
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.