Which Assassin's Creed game best utilized social stealth mechanics?

Social Stealth Mechanics
Assassin's Creed
Assassin's Creed
Games
Social Stealth Mechanics poll options
Social Stealth Mechanics
Assassin's Creed
Assassin's Creed
- Assassin's Creed II
- Assassin's Creed IV: Black Flag
- Assassin's Creed: Unity
- Assassin's Creed: Syndicate