Solo Aerith vs. Odin [

This is why I say Tifa makes a better mage. Aerith takes a little too long to get going, so despite her high magic stat and Arcane Ward, mage Tifa leaves her time in the dust. Still pretty mighty though.
Build:
Ceremonial Staff - M Atk + 20, Lightning Damage Up, ATB Charge Up, Reprieve
Cetran Bracer/Armlet
Genji Glove
Materia:
Enemy Skill
ATB Boost
Time
Lightning x 4 + Elemental, Swiftcast, MP Absorb, Magic Focus
Magic Up
First Strike
Skill Master
Phoenix