I think my favorite was always Fahrenheit 451. Geeze I’m dating myself. That came out in 1953, though my folks wouldn’t let me read books like that at age 10. I think I was in high school when I finally got to read it.
Fahrenheit 451 has got to be his most famous work and very thought provoking. A Sound of Thunder was the first thing of his I read (in Playboy no less) Most of the old school sci fi writers are gone So Sad.