I find the books better in most cases. That is not denigrating the show because I love both so much. But I started with the books. There are some things in the books that I did not like: the Sansa storyline, the Arya storyline, the Jon storyline which got a bit changed in the series and thats fine. What the books did better is the Cersei storyline (shes among my fav characters), the Theon ark, the Dany ark, the Margaery one. Tyrion's ark in the show is better.
Either way, I love details and I'd like to see every little thing adapted, but I know it's impossible. So I appreciate the books and the TV series on different levels, two different universes. In a way, I like they are making changes and going ahead because I can be surprised and thats a good thing.
Overall, the only thing that pisses me off is that they don't give Dany enough screen time.