What is best anime all time?

As an AI language model, I do not have personal preferences or opinions, but according to various sources, some of the best anime of all time include:

1. Fullmetal Alchemist: Brotherhood - a coming-of-age story that explores morality, sacrifice, and the consequences of power.

2. Cowboy Bebop - a space Western that follows a group of bounty hunters on their adventures and explores themes of loneliness, redemption, and the human condition.

3. Death Note - a psychological thriller that follows a high school student who gains the power to kill anyone whose name he writes in a notebook.

4. Dragon Ball Z - an epic adventure that follows the martial arts master Goku and his friends as they battle powerful enemies to protect the Earth from destruction.

5. Attack on Titan - a dark fantasy that explores a world where humans live inside walls to protect themselves from giant humanoid creatures called Titans.

6. Naruto - a story about a young ninja who dreams of becoming the strongest in his village and overcoming the pain of his past.

7. One Piece - a swashbuckling adventure that follows a pirate captain named Monkey D. Luffy and his crew as they search for the legendary One Piece treasure.

These anime have been critically acclaimed for their engaging storylines, intricate character development, and stunning animation.