Denis Wick 5BFL vs Marcinkiewicz CH 5FLB
The Marcinkiewicz CH 5FLB has a wider cup diameter, the Denis Wick 5BFL has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH 5FLB has a cup diameter of 17.25 mm / 0.6791 in compared to 16.00 mm / 0.6299 in on the Denis Wick 5BFL — a difference of 1.25 mm / 0.0492 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Denis Wick 5BFL has a wider throat (4.45 mm / 0.1752 in vs 4.09 mm / 0.1610 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.