+3
I tend to favor stories that flawlessly execute on a smaller scope than ones that execute well on a larger scope. So by that measure, it's Breaking Bad. It's a better story, better told.
That's how I respond to the stories, though, with no regard for what went into them. If I were judging them as productions, you'd probably have to say Game of Thrones is more impressive. More work, more storylines, and just a ridiculous undertaking in a technical sense. I am more impressed with the effort and efficiency of Game of Thrones, even though I'm more impressed with the elegance and overall storytelling of Breaking Bad. But since I tend to favor the former, Bad gets the nod.