This is how Avenger and Arcanist differ from the normal Armor version:
Arcanist uses MP for some of the skills Arcanist's Harmonic Might gives +50 INT (at lvl 150) Arcanist's Summon Steed attacks use INT/CHA Arcanist's Lay on Hands uses INT
Avenger's Harmonic Might gives +35 STR/DEX (at lvl 150) Avenger's Summon Steed attacks use STR/CHA if you use a Melee weapon or DEX/CHA if you use a Ranged or Magic weapon Avenger's Redeemer's Might uses STR/END if you use a Melee weapon and DEX/END if you use a Ranged or Magic weapon Avenger's Overwhelming Light (overcharged Inner Light) uses normal skill cost + HP cost