which is better for pets, 10% damage or 10% armor reduction

[wvhills]

I use damage for trash mobs and armor reduction for bosses. You'd be surprised HOW fast an elite boss goes down when everyone uses armor reduction on him. And I believe it stacks.

what i don't understand is how with four rogues in arena all spamming aimed shot and me using grim and two rogues using malison how do the bosses have any armor left? There has to be some type of limit on how much armor reduction can occur. I think aimed shot's armor reduction can stack up to 3 times. with 4 rogues and 2-3 armor reducing pets that's A LOT of armor reduction!