Bach 12E vs Bruno Tilz 215-9 1/2 GS
The Bruno Tilz 215-9 1/2 GS has a wider cup diameter, the Bruno Tilz 215-9 1/2 GS has a larger throat opening.
Cup Diameter
The Bruno Tilz 215-9 1/2 GS has a cup diameter of 29.50 mm / 1.1614 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 5.00 mm / 0.1969 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 Bruno Tilz 215-9 1/2 GS has a wider throat (7.00 mm / 0.2756 in vs 5.85 mm / 0.2303 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.