% > ATP ?

[Arika]

It's pretty easy to figure out which one is better, assuming I still know how elements work. If the elemental boost to the weapon is higher than the boost in atp you'd get from getting a better weapon, then the elements will do more damage. A 15% light Katsuno-zashi will do more damage than a serafi on a dark mob, for instance, because a serafi's atp is less than 15% higher than a katsuno's.
So, on average, a low level high elemental weapon would do more damage than a high level low elemental weapon, assuming their atp is close enough together.

yes, that is nice conclusion. I would like to add that you can alway calculate Elemental % into ATP amount.
since you only care ATP, just convert that element % value (gain) to ATP(gain from element) compare to ATP value (lose from weapon) : check gain vs lose = your own case.
Consider that elemental % is depend on who you are. So ,it is so pointless here to say which one is better.