Bach 1 vs Warburton 3M
The Bach 1 has a wider cup diameter, the Bach 1 features a deeper cup.
Cup Diameter
The Bach 1 has a cup diameter of 17.50 mm / 0.6890 in compared to 16.50 mm / 0.6496 in on the Warburton 3M — a difference of 1.00 mm / 0.0394 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 1 has a very deep cup while the Warburton 3M has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 3.66 mm / 0.1441 in, so resistance feel will be comparable.
Finish
The Bach 1 is listed as unspecified, and the Warburton 3M as Silver plate. Finish mainly changes lip feel, tarnish resistance, and appearance rather than cup geometry.
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.