well some guy did the math and the 41 att doesn't beat the 30% boss set effect from RA so fafnir is still the way to go[/quote]
Thats not how the math works actually...atk, boss%, and damage are not linear. (current atk, current boss%, atk%, total dmg% all contribute)
And what you're describing is a very specific case rather than a general truth.
EE's also give more atk/star