User blog comment:Ein Inferno/NP Damage Comparisons/@comment-37434315-20181123095850/@comment-27971189-20181123101635

Both are different things.

Class attack is each classes own damage multiplier, thus you can find Saber with 10k ATK hit relatively harder than Assassin with 10k ATK.

Class triangle is when they attack those weak against them. Saber attacking Lancer, Lancer attacking Archer. That one is class triangle multiplier.