Critical Damage build
x2 Superior rings of crit damage (40% crit damage)
Dexterity focused Superior Battlemage Armor (47 crit damage)
Wrath of the Lovias (56 crit chance , 21 crit damage, 16% attack)
Superb Amulet of Dexterity (10% crit damage)
Mask of the Grand Duchess (15 crit chance)
This gives you 158 crit damage including your starting bonus, at 76% crit chance. And 16 attack of course. 158 crit damage at 76% crit chance is effectively a 120% modifier on all attacks on average. So basically a %136 modifier.
Attack% build
Encore gives you 82 attack %
Superior Battlemage Cowl gives you 10% attack
Superior Battlemage Armor with both Battlemage armor arms and legs give you 22% attack(without a masterwork boost).
Superior Ring of Attack gives you 10% attack
Ring of Assault gives you 5% attack
Superior Amulet of Magic gives you 5% attack
You also have 5% crit chance and 40 crit damage which is effectively a 2% damage increase on all attacks.
Equaling a 136 Attack% modifier.
So, really neither is a bad idea.