Bruno Tilz 214-D 5 vs Yamaha SL-54L
The Yamaha SL-54L has a wider cup diameter, the Yamaha SL-54L has a larger throat opening.
Cup Diameter
The Yamaha SL-54L has a cup diameter of 26.15 mm / 1.0295 in compared to 26.00 mm / 1.0236 in on the Bruno Tilz 214-D 5 — a difference of 0.15 mm / 0.0059 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 Yamaha SL-54L has a wider throat (7.11 mm / 0.2799 in vs 6.30 mm / 0.2480 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.