Looks like Breaking Bad has better lead actors, doesn't take itself nearly as seriously as The Shield, and has a more unique premise to latch on.
That would just be my observation.
The episodes I've seen Breaking Bad is way more serious and heavy handed than The Shield. If it gets less so I'd actually give it a shot, that oppressive depressiveness is what turned me off. Reminded me of that plastic surgeon show in FA, super dark just for the sake of being super dark.
Also wow been a long time since I over served myself to the point of puking. What a great night.