Bruno Tilz 210-S 4 E vs Bruno Tilz 210-S 9 E
The Bruno Tilz 210-S 9 E has a wider cup diameter, the Bruno Tilz 210-S 9 E features a deeper cup, the Bruno Tilz 210-S 9 E has a larger throat opening.
Cup Diameter
The Bruno Tilz 210-S 9 E has a cup diameter of 17.00 mm / 0.6693 in compared to 16.50 mm / 0.6496 in on the Bruno Tilz 210-S 4 E — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 210-S 9 E has a deep cup while the Bruno Tilz 210-S 4 E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 210-S 9 E has a wider throat (3.70 mm / 0.1457 in vs 3.50 mm / 0.1378 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.