Bruno Tilz 214-D 5 vs Marcinkiewicz CH 9B
The Marcinkiewicz CH 9B has a wider cup diameter, the Marcinkiewicz CH 9B has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH 9B has a cup diameter of 26.06 mm / 1.0260 in compared to 26.00 mm / 1.0236 in on the Bruno Tilz 214-D 5 — a difference of 0.06 mm / 0.0024 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Marcinkiewicz CH 9B has a wider throat (6.35 mm / 0.2500 in vs 6.30 mm / 0.2480 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.