The walking dead is a great show for the original zombie feeling, however game of thrones is even more original because its in a very enjoyable era of time, and its based on a book in which the details are far greater than anything can be absorbed through tv. I have not read the books however I have read a little paragraph and I understood the show could never do the book justice, but showed the general idea of what happened, stretched on for 7 seasons.
The walking dead has changed the story a great deal since the show started, and at this point I feel like they're simply making it up as they go lol still one of my favorites to watch, and hate to wait for