Bruno Tilz 310-M 28 vs Giardinelli Helleberg
The Bruno Tilz 310-M 28 has a wider cup diameter, the Giardinelli Helleberg features a deeper cup, the Giardinelli Helleberg has a larger throat opening.
Cup Diameter
The Bruno Tilz 310-M 28 has a cup diameter of 33.50 mm / 1.3189 in compared to 33.30 mm / 1.3110 in on the Giardinelli Helleberg — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Giardinelli Helleberg has a very deep cup while the Bruno Tilz 310-M 28 has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Giardinelli Helleberg has a wider throat (8.35 mm / 0.3287 in vs 8.30 mm / 0.3268 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.