breaking bad > everything
Breaking bad is a really good show, but it is on the downside, having exausted most of the good ideas IMO so far.
I still have a great respect for that show though, because it gave AMC the courage they needed to go out and produce something entirely out of the mainstream. (after they saw HBO having success with True Blood)
This "risk' I am talking about is what gave us all of these cool TV shows like "GOT" and "TWD".
That being said, Game of thrones is the best. The storyline of GOT and TWD are probably about equal badass... but GOT goes over the top when it comes to location, scenery, production quality, sets, props, costumes... everything that is involved in a major television production.
Wait until season 2 of GOT is complete, they are going to knock it out of the park.