Barbarian Weapon Question

[Radiskull]

I have a level 56 barbarian shaman that I haven't played in months. Now that my cleric is about to reach level 60, I'm probably going to pick up the shaman again. I don't want to be a shaman that sits around and right clicks my JBB for dps and buff bots during down time. I'm curious as to which weapon is better for an active melee dps type play style, Granite Face Grinder (better damage ratio) or Barbarian Spiritist's Hammer (with the proc). Any input would be much appreciated!