Strongest Artoria(s)...
5. Artoria Pendragon (Saber) (Alter) (Fate/stay night)
4. Godess Rhongomyniad (Lancer) (Unsealed) (Inter-changable with 3) (Fate/Grand Order)
3. Artoria Pendragon (Saber) (Unsealed) (Inter-changable with 4) (Fate/stay night)
2. Arthur Pendragon (Saber) (Unsealed) (Fate/Prototype)
1. Artoria Avalon (Grand Saber) (Caster) (Unsealed) (Fate/Grand Order)