Board Thread:FAQs/@comment-26395021-20150519000208/@comment-25555436-20150519023155

Manghild, if one only crushes the ground with it like with the G-Hammer, would be pretty much exactly the same, though with probably bigger "shockwave" on impact. And probably work on limited ammo instead of limited energy, though the difference is relatively small.

So, really, if both are used the same way, they would be like any Halo G-Hammer duel: Whoever hits first wins.