Personally I find it hard to rate ones above the other, because they are all situational on the girls. So I just have ones I consider Useful and ones that aren't.

Useful - Atk, Def, Affliction Resist Down (I only use with my Debuffers), Ability Damage (Most useful on girls that have multi-hit Abilities, like Susanoo, Azazel, Ares, etc)

Ok - HP, Drop Rate (I'm a Snatch and drop rate believer), Burst Damage (For Burst Specialists like Uriel)

Fodderable - Mode Gauge Reduction, Atk Rate, Affliction Resist Up