for PVP Gigantic Bomb have higher damage to players, but the Cyclone Axe will always have above the indicated damage from the description, coz the damage is distributed into 45hits and its will be imposible that there will be no crit hits with that many hits, though it will not achieve full crit boost, coz all hit cant be crit hits, it gives constantly higher damage
i chose cyclone axe beacause of the reason above, and another factor is that i want to become a barbarian