Quote Originally Posted by Unregistered View Post
Question :
45% element or 45% character atk and 20% hp buff?
What MLB eido ends in 45% char atk/20% hp?
Hmm, can't think of any right now... do you maybe mean 40% char atk/20% hp?

Anyway the simple answer is if you're new with underdeveloped grids (i.e. your wpns don't have SLs on 'em), the 40char%/20%hp will likely help you more with most content.
And if you're a player with fully developed grids, or mostly developed even, you'll want the elemental atk↑ eidos then for better dmg.

If you want more in depth info on why that is, you'll need to understand how the dmg formula works in this game.
The really simple version of the dmg formula is this:
your atk stat * (1 + total character attack) (eg. Character ATK eidos, Assault/Pride weapon skills, Attack buffs, Assist bonuses) * (1 + what your ele. adv is + total elemental attack) (eg. Element ATK eidos, Soul Relic Attack Weapons, Element ATK buffs)

Once you understand this simplified version of the formula, you'll then start to know how to properly build for dmg and which eidos you'll want to choose, etc...