Marcinkiewicz CH R 5S vs Yamaha HR-29B
The Marcinkiewicz CH R 5S has a wider cup diameter, the Marcinkiewicz CH R 5S has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH R 5S has a cup diameter of 17.75 mm / 0.6988 in compared to 17.07 mm / 0.6720 in on the Yamaha HR-29B — a difference of 0.68 mm / 0.0268 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 CH R 5S has a wider throat (5.23 mm / 0.2059 in vs 3.90 mm / 0.1535 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.