Conn Imp. Precision 2 vs Marcinkiewicz 5*W (Endorsee)
The Marcinkiewicz 5*W (Endorsee) has a wider cup diameter, the Conn Imp. Precision 2 features a deeper cup.
Cup Diameter
The Marcinkiewicz 5*W (Endorsee) has a cup diameter of 16.76 mm / 0.6598 in compared to 16.41 mm / 0.6461 in on the Conn Imp. Precision 2 — a difference of 0.35 mm / 0.0138 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Conn Imp. Precision 2 has a — cup while the Marcinkiewicz 5*W (Endorsee) has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Conn Imp. Precision 2 is described as Silver-plated brass, and the Marcinkiewicz 5*W (Endorsee) as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.