Premium Cubes, Weapons and PDR Ignore Potential

It's situational when % ignore could be one of the best stats.

Bossing-wise it is the best for most characters. Let's say you are at Zakum which has a 40% PDR and you have 15% ignore.
W/ ignore: 100% damage - ( 40% x 0.85) = 66% dmg dealt
W/o ignore: 100%-(40%)=60% dmg dealt
66/60=1.1=10% dmg increase
This number goes up as PDR goes up and doubles if you had 30% instead of 15%.

Keep in mind this is for bossing and not training. If you wanted the best training weapon then it would probably be a mixture of % dmg, % main stat, and % atk