Bruno Tilz 211-B 10 vs Kelly MC
The Bruno Tilz 211-B 10 has a wider cup diameter, the Kelly MC features a deeper cup, the Bruno Tilz 211-B 10 has a larger throat opening.
Cup Diameter
The Bruno Tilz 211-B 10 has a cup diameter of 18.00 mm compared to 16.76 mm on the Kelly MC — a difference of +1.24 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Kelly MC has a very deep cup while the Bruno Tilz 211-B 10 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 211-B 10 has a wider throat (4.20 mm vs 3.80 mm). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Material
The Bruno Tilz 211-B 10 is described as unspecified, and the Kelly MC as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.
Which is better?
The Bruno Tilz 211-B 10 is designed for catalog playing, while the Kelly MC targets general use. Your best choice depends on your musical context.