Denis Wick 3SL vs Marcinkiewicz W1
The Marcinkiewicz W1 has a wider cup diameter, the Marcinkiewicz W1 has a larger throat opening.
Cup Diameter
The Marcinkiewicz W1 has a cup diameter of 33.66 mm / 1.3252 in compared to 31.25 mm / 1.2303 in on the Denis Wick 3SL — a difference of 2.41 mm / 0.0949 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Marcinkiewicz W1 has a wider throat (7.67 mm / 0.3020 in vs 7.62 mm / 0.3000 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.