Bach 16 vs Marcinkiewicz 17
The Marcinkiewicz 17 has a wider cup diameter, the Bach 16 has a larger throat opening.
Cup Diameter
The Marcinkiewicz 17 has a cup diameter of 17.42 mm / 0.6858 in compared to 16.25 mm / 0.6398 in on the Bach 16 — a difference of 1.17 mm / 0.0461 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 Bach 16 has a wider throat (4.50 mm / 0.1772 in vs 4.39 mm / 0.1728 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.