Just trying to recount how many times the (mainstream) comics have gone over this.
1) The Golden Age version, not sure of the exact issue number or year.
2) In the Silver Age, they changed his origin so he was Superboy first, not sure if they ever retold the Krypton origin.
3) 1986-87. Post-Crisis. Man of Steel #1-6 by John Byrne (1986).
4) 2003-04. Superman: Birthright. They redid the origin again, but I'm not sure what the in-universe explanation was for time, and his origin, changing.
5) 2009-10. New Earth (Post-Infinite-Crisis) Superman: Secret Origins, by Geoff Johns.
6) New 52, by Grant Morrison.
What's your favorite?
Also, does anyone know the information missing above? Like what the in-universe explanation was for the origin changing to that in Birthright?