Better Call Saul, created by Vince Gilligan and Peter Gould as a Breaking Bad prequel, is the story of Jimmy McGill's transformation into the morally bankrupt lawyer Saul Goodman. What began as a risky spinoff became, for many critics, the superior show — a slower, more novelistic character study that took greater risks and achieved more formal experimentation than its parent. Bob Odenkirk and Rhea Seehorn's performances are among the finest in television history, and the show's final season — which bridges into Breaking Bad's timeline — is a structural and emotional masterpiece. Better Call Saul demonstrated that the age of great prestige television had not ended.

Reference:

Wikipedia: Better Call Saul

https://en.wikipedia.org/wiki/Better_Call_Saul