Originally Posted by
Aidoru
The raw stats alone is enough of a reason to go Typhon.
According to the JP wiki, Fafnir is 12% atk/def buff and Typhon is 10% atk. The difference in raw stats easily makes up the difference in atk and the higher base HP only adds more HP with Crom as a main and friend eidolon if using another Crom, which feels like it can probably make up for 10% defense worth of damage mitigated.
Fafnir's buff also only last 2 turns and has a 10 turn cooldown. Typhon lasts 3 turns and is 8 turn cooldown.