Marcinkiewicz CH 4S vs Schilke M2X
The Schilke M2X has a wider cup diameter, the Schilke M2X has a larger throat opening.
Cup Diameter
The Schilke M2X has a cup diameter of 17.27 mm / 0.6799 in compared to 17.20 mm / 0.6772 in on the Marcinkiewicz CH 4S — a difference of 0.07 mm / 0.0028 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 Schilke M2X has a wider throat (3.84 mm / 0.1512 in vs 3.73 mm / 0.1469 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.