Monette Unity MF VI vs Schilke 13A4a
The Schilke 13A4a has a wider cup diameter, the Monette Unity MF VI has a larger throat opening.
Cup Diameter
The Schilke 13A4a has a cup diameter of 16.76 mm / 0.6598 in compared to 16.25 mm / 0.6398 in on the Monette Unity MF VI — a difference of 0.51 mm / 0.0201 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Monette Unity MF VI has a wider throat (3.81 mm / 0.1500 in vs 3.66 mm / 0.1441 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.