-Hate will be slightly less due to lower white damage, but enmity down bonuses are the same.
Since you're mentioning lowman content, Annihilator shines on high-end enemies for the ultra-low enmity generation and the big chunk to r.atk/r.acc that may be necessary for said targets.
Wildfire generates low enmity aswell, albeit nowhere close to Annihilators.
That said, Last Stand on Annihilator is potent, but if the r.atk/r.acc isn't doing anything, which I'll assume it isn't in your case, Last Stand Armageddon will actually do more damage.