Giardinelli 3M vs Giardinelli Sym. T
The Giardinelli 3M has a wider cup diameter, the Giardinelli Sym. T features a deeper cup.
Cup Diameter
The Giardinelli 3M has a cup diameter of 26.30 mm / 1.0354 in compared to 25.80 mm / 1.0157 in on the Giardinelli Sym. T — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Giardinelli Sym. T has a deep cup while the Giardinelli 3M has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 6.40 mm / 0.2520 in, so resistance feel will be comparable.
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.