Fire vs. Death heavy bless

[Agema]

Entirely as Max said.

If your sacred has generally fairly average non-bless stats and is attacking fairy average opponents, F9 will cause damage-dealing at up to twice the rate D9 will.

D9 gets you a far better magical Pretender and other situational benefits, but if your tactic is an explosive early expansion using sacreds, you'd take the F9 bless.