Kinds of Stacker Builds?

Attack based stacker builds are the strongest for harder content right? This 96 char of mine does 4 ghost The Feared Valdo´s for fun. What kinds of stackers are there?


Trauma
Strenght
Armour
Aura/Armour


PS: Why ppl dont do armour stacker elemental hit? Seems so much better them a tiny aura from smite...