Warburton 2M vs Warburton 3M
The Warburton 2M has a wider cup diameter, the Warburton 2M features a deeper cup, the Warburton 2M has a larger throat opening.
Cup Diameter
The Warburton 2M has a cup diameter of 16.78 mm / 0.6606 in compared to 16.50 mm / 0.6496 in on the Warburton 3M — a difference of 0.28 mm / 0.0110 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Warburton 2M has a 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
The Warburton 2M has a wider throat (3.70 mm / 0.1457 in vs 3.66 mm / 0.1441 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Finish
Both the Warburton 2M and Warburton 3M are listed with the same finish (Silver plate).
Which is better?
The Warburton 2M is designed for orchestral playing, while the Warburton 3M targets all-round use. Your best choice depends on your musical context.