Marcinkiewicz 5*W (Endorsee) vs Yamaha CR-16ES-GP
The Yamaha CR-16ES-GP has a wider cup diameter, the Yamaha CR-16ES-GP features a deeper cup, the Yamaha CR-16ES-GP has a larger throat opening.
Cup Diameter
The Yamaha CR-16ES-GP has a cup diameter of 17.05 mm / 0.6713 in compared to 16.76 mm / 0.6598 in on the Marcinkiewicz 5*W (Endorsee) — a difference of 0.29 mm / 0.0114 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Yamaha CR-16ES-GP has a very deep 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.
Throat Diameter
The Yamaha CR-16ES-GP has a wider throat (3.98 mm / 0.1567 in vs 3.91 mm / 0.1539 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.