I think Breaking Bad is the much better show.

They had a core idea: to turn a 'good' person into a 'bad' person. What makes the show truly great is how committed they are to this. They were fearless in taking the character down very dark paths even when they knew the audience might react poorly. They understood that even if we liked Walt, we had to see him 'break bad', to the point where he turns into a repulsive antagonist for the whole of the last season. This fearlessness gives the show its power.

Better Call Saul suffers from not being committed to anything. The writers have openly acknowledged that the show was going to be about Saul Goodman but they liked Jimmy so much that they kept stalling on his transformation to Saul, dragging their feet, taking things back. It's the opposite of Breaking Bad. They are not committed enough to turn the guy into Saul because they "like him."

This is a problem for the other stories too. There's really not much rhyme or reason to Mike, Gus, and Nacho being there. They are remnants of a show that never was. Their storyline has very little depth and we learn almost nothing about Mike and Gus that we didn't already know.