Bruno Tilz 310-M 12 vs Yamaha BB-BOBO-SOLO-GP
The Bruno Tilz 310-M 12 has a wider cup diameter, the Yamaha BB-BOBO-SOLO-GP has a larger throat opening.
Cup Diameter
The Bruno Tilz 310-M 12 has a cup diameter of 32.50 mm / 1.2795 in compared to 32.20 mm / 1.2677 in on the Yamaha BB-BOBO-SOLO-GP — a difference of 0.30 mm / 0.0118 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 Yamaha BB-BOBO-SOLO-GP has a wider throat (7.50 mm / 0.2953 in vs 7.40 mm / 0.2913 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.