"Joker," directed by Todd Phillips and released in 2019, received widespread acclaim for its dark and gritty portrayal of the iconic comic book character. Joaquin Phoenix's performance as Arthur Fleck earned him an Academy Award for Best Actor. The film explores themes of mental illness, societal neglect, and the impact of isolation, sparking discussions about its moral implications. While some praised its artistic vision and storytelling, others criticized its violent content and portrayal of mental health. Overall, it is considered a significant and provocative film in modern cinema.

As of now, "Joker: Folie à Deux," the sequel to the 2019 film "Joker," has generated significant anticipation and mixed expectations. Directed by Todd Phillips and starring Joaquin Phoenix and Lady Gaga, it explores themes of mental illness and societal issues, similar to its predecessor. Early reviews and audience reactions are yet to be fully available since the film is set to release in 2024. For an informed opinion, it’s best to check reviews closer to its premiere date.

The title of "best Joker" often sparks debate among fans. Many consider Heath Ledger's portrayal in "The Dark Knight" (2008) to be iconic, earning him a posthumous Academy Award for Best Supporting Actor. His performance was praised for its intensity and depth, bringing a chaotic realism to the character. Joaquin Phoenix's portrayal in "Joker" (2019) also received critical acclaim, earning him an Academy Award for Best Actor for his exploration of Arthur Fleck's psychological struggles. Ultimately, the "best" Joker varies by personal preference and interpretation.

In the movie "Joker" (2019), the character Arthur Fleck, who becomes the Joker, is portrayed by Joaquin Phoenix. As of now, Joaquin Phoenix is set to reprise his role in the upcoming sequel, "Joker: Folie à Deux," which is scheduled for release in 2024. Therefore, both films feature the same actor in the role of the Joker.