With 14 Augments, it breaks down like this:
14 x Aim Augments with group buffs and talents = 57.5 damage bonus and 0.93% crit
14 x Power Augments = 58 damage bonus.
So, in a raid setting with full group buffs and the +9% Aim talent you would only lose .5% damage but gain nearly a full point of crit.
Stick with the Aim augments.
He already answered why aim is still better.