The debate of the best Joker performance in live-action movies never seems to stop. Some still believe Jack Nicholson matched the aura of The Joker, while others are firm in their belief that Heath Ledger was the one who best brought the comic book villain to life. Some fans even enjoy Joaquin Phoenix's unique take on the character. Nevertheless, all of these Jokers have interesting qualities in their films, but instead of judging who was the best at being the Joker, maybe the conversation should be about who was the most dangerous.
Source:https://www.cbr.com/dark-knight-joker-most-dangerous-version/