Bruno Tilz 302-29 vs Yamaha HR-33C4
The Yamaha HR-33C4 has a wider cup diameter, the Bruno Tilz 302-29 has a larger throat opening.
Cup Diameter
The Yamaha HR-33C4 has a cup diameter of 17.68 mm / 0.6961 in compared to 17.50 mm / 0.6890 in on the Bruno Tilz 302-29 — a difference of 0.18 mm / 0.0071 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 Bruno Tilz 302-29 has a wider throat (4.00 mm / 0.1575 in vs 3.98 mm / 0.1567 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.