Brotherhood/2 more freedom and precision in the movements, unity in second mostly because of parkour down and cool animations, also paris is awesome for parkour

AC 3 because you can climb trees

3 was my favorite for many reasons. Mostly because I got to fight a war a few of my ancestors actually fought (members of my family fought on both sides of the revolutionary war) and seeing the war the basically laid the foundation and the first bricks that would eventually become the French revolution is awesome

Revelations only because the hook blade seemed so genius at the time the game released

Assassin's Creed Syndicate because it is so smooth fluid and the best in parkour in the Assassin's Creedverse