The Wire shits on Breaking Bad.
There were more characters in the wire, thus many more subplots, thus more complexity by default.
Breaking Bad is an entirely different type of show. The transition of Walt is the vehicle in which drives the show, and it is the absolute best of its kind.
Cop drama with a thousand and one subplots going on at all time, in which you literally care about every single one? No doubt, The Wire.
Which one is easier to do? The Wire. Making a series that centers around the mental, emotional evolution of one man, and have it be as compelling as Breaking Bad is damn near fucking impossible.
Both great shows, but The Wire does not shit all over BB.
Side Note: If the next [half] season of TWD doesn't change, I may be done with it. One of my favorite shows ever, but nothing ever fucking happens until the end of every episode, which is just plain lazy fucking writing. TWD is becoming nothing more than a cheap old school matinee cliff hanger.
Also, Boardwalk has picked up and is on its way to becoming a legendary masterpiece, whilst Dexter, while very watchable, remains poorly written and filled with plot holes.