Personally I think Enchanter and Knight are the strongest.
Some skills that I highly recommend:
- Hail Strike
- Rage
- Restoration
- Teleport
Completely agree with all of that. Every mage should start Enchanter and every melee should start Knight. They're kind of like starting Royalty in Demons' Souls, or Pyromancer in Dark Souls 1. Significantly stronger than everything else available.
To that skill list, I'd add:
- Adrenaline
- Phoenix Dive (on melee) / Tactical Retreat (on everyone else)
- Winter Blast
- Electric Discharge
- Impalement
- Armor of Frost
- Crushing Blow
- Battering Ram