"Great Expectations" (1861) is often considered the most autobiographical of Dickens' novels. It reflects his own childhood experiences of poverty and hardship, his longing for a better life, and his complex relationship with his father. While the story is fictional, the emotional core resonates strongly with Dickens' own life.
"David Copperfield" (1850) is another prime contender. It is considered Dickens' most personal novel, with many characters directly inspired by people in his life. The novel's themes of social mobility, education, and family relationships are also deeply personal to Dickens.
"Little Dorrit" (1855-1857), though not directly autobiographical, reflects Dickens' own struggles with debt and the harsh realities of Victorian prisons. This novel is also notable for its portrayal of the lower classes, something that resonated deeply with Dickens, who grew up in poverty.
"Oliver Twist" (1837-1838), while not as explicitly biographical as the others, reflects Dickens' own experiences in the workhouse system and his passionate advocacy for social reform.
It's important to remember that these novels are still works of fiction, and their focus is not solely on Dickens' life. They use his experiences as a foundation for creating engaging stories with universal themes.
Instead of claiming one novel as *more* biographical, you could argue that each of these novels offers a different lens into the life and experiences of Charles Dickens.