Better Call Saul is a prequel to Breaking Bad. Created by the same individuals, Vince Gilligan and Peter Gould, both shows exist within the same universe and share a number of characters. The series chronicles the story of a small-time lawyer Jimmy McGill, who eventually becomes Saul Goodman, the morally compromised lawyer representing Walter White and other criminals in Breaking Bad. Better Call Saul is largely set before the events of Breaking Bad. However, it also includes scenes set during and potentially after Breaking Bad (represented in black and white sequences), providing additional depth and context to the evolving character of Jimmy McGill/Saul Goodman. Watching order actually depends on your preference. If you have already seen Breaking Bad, you will appreciate the backstory and character development in Better Call Saul, not just for Jimmy McGill/Saul Goodman, but also for other Breaking Bad characters like Mike Ehrmantraut. Furthermore, certain scenes or dialogue may have a deeper impact given the knowledge of their future from Breaking Bad. Alternatively, if you choose to watch Better Call Saul first, it would be like watching events unfold chronologically. But the creators crafted Better Call Saul in such a way that no prior knowledge of Breaking Bad is necessary to understand and enjoy the story. Just be prepared for some potential spoilers for Breaking Bad. In short, the two series complement each other. While Breaking Bad provides the dramatic climax to the stories initiated in Better Call Saul, Better Call Saul offers more measured and in-depth character studies which form the basis for the characters' actions in Breaking Bad.