Related
Sprite
Minimum Level
40
Earned
Eureka B7
Strength Grade
C+
Agility Grade
B+
Vitality Grade
B+
Intelligence Grade
A
Mind Grade
A
Battle Command 1
Fight (4 skill points per use)
Battle Command 2
Magic (12 skill points per use)
Battle Command 3
Run (no skill points)
Battle Command 4
Item (4 skill points per use)
Available Magic
Black Magic LV. 1–8, White Magic LV. 1–8, Summon Magic LV. 1–8
So, let's get this straight: the Sage has access to every Spell (though they can't use the Evoker version of Summon Spells), has the highest stats aside from a slight disadvantage in Intelligence compared to the Magus, and has way more MP than any other mage Job... yeah, it's safe to say the Sage is the best magic using Job in the game. There's no reason to use any other spellcaster once they're available. (Even the Magus's Intelligence isn't really relevant since the Sage has access to excessively powerful Summon Spells.)
Early in the game, Tellah has a pitiful selection of Spells but a large MP pool. Eventually he will learn almost every Spell in the game, at which time his MP pool becomes pitifully small. Tellah will make extensive use of Psych. Before learning his Spells, he can use Recal to cast one at random. This is rarely useful, but when it works the results can be amazing.