Conn Imp. Precision 3 vs Warburton 3M
The Warburton 3M has a wider cup diameter.
Cup Diameter
The Warburton 3M has a cup diameter of 16.50 mm / 0.6496 in compared to 16.41 mm / 0.6461 in on the Conn Imp. Precision 3 — a difference of 0.09 mm / 0.0035 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Finish
The Conn Imp. Precision 3 is listed as unspecified, and the Warburton 3M as Silver plate. Finish mainly changes lip feel, tarnish resistance, and appearance rather than cup geometry.
Material
The Conn Imp. Precision 3 is described as Silver-plated brass, and the Warburton 3M as unspecified. Material affects mass, warmth, and how quickly the piece responds.
Which is better?
The Conn Imp. Precision 3 is designed for general playing, while the Warburton 3M targets all-round use. Your best choice depends on your musical context.