The Walking Dead
In terms of drama, narrative, character development, artistic merit, tone, themes, acting, production value, emotional weight and the list goes on and on... Breaking Bad simply trumps TWD in every department. The gold standard of TV drama.
The Walking Dead can only compare to Breaking Bad when it is at it’s very best, And it’s been a long time since then. The show is worn out and beaten up. Every episode just makes it worse. They barely have a cast left, And it’s missing that charm it used to have. All of the character archs have been completed, But it’s getting milked. Such a shame, It used to be fantastic.
It's a matter of observation and plot construction. Breaking Bad ended after a careful development of all its characters, Exactly where it was supposed to end. The Walking Dead keeps presenting a series of people who still have an urge to rule in the middle of a zombie apocalypse, And the same formula repeats itself over and over until the show becomes one of the zombies.