Every mouthpiece is a compromise and there will be a trade off with heavier mouthpieces.
Some players may experience a decrease in overtones with heavy mouthpiece blanks while others will benefit from a more solid feel to the note center.
Remember the Trumpet, Mouthpiece, and Player must match.
If one is changed the others must be able to accommodate the change or be changed as well. Mouthpiece mass is a personal choice.
Most players prefer the standard GR Classic Blank.