Curry 1.5 B vs Marcinkiewicz 10S
The Curry 1.5 B has a wider cup diameter, the Marcinkiewicz 10S has a larger throat opening.
Cup Diameter
The Curry 1.5 B has a cup diameter of 17.02 mm / 0.6700 in compared to 16.84 mm / 0.6630 in on the Marcinkiewicz 10S — a difference of 0.18 mm / 0.0070 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 Marcinkiewicz 10S has a wider throat (3.73 mm / 0.1469 in vs 3.70 mm / 0.1455 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.