I've only seen The Wire and Breaking Bad, loved both, I was thoroughly entertained. Kinda depends what you're looking for.
The Wire:
Best character development I've ever seen. If you're into Robert Altman - style ensemble casts and hyper-realistic storytelling that make you think about fictitious people as you actually know them, this is the best. Characters like Omar, Stringer and Snoop are probably my favorite fictional characters ever.
BB:
Best cinematography I've seen on TV. Great dark humor. Each season builds very slowly towards a great payoff, but requires patience. Some characters (like WW's wife and SIL) can be infuriating and hard to watch. The show's tone changes a lot over the course of the 5 seasons, from light-hearted, funny, violent thriller to extremely dark. You'll watch 5 episodes wondering where things are going and BAM, get hit in the face and wonder what the hell just happened.
I've binge-watched both shows and enjoyed them completely. It's hard for me to recommend one over the other.