I watched the show and then started reading the first book. From what I can tell so far a lot of the weird writing decisions that confused or annoyed me in the show are not present in the book, though there are other aspects of the show I liked a little bit more than the book like how some of the characters are portrayed.
Overall I’d say both versions are good with the book being slightly better. I would recommend the show whether you intend to read the book or not.
This is hired I felt too. I just finished the first book. The entire 10 episodes of the first season probably got 1/2 way through the book. There were frustrating moments in the series and a lot of drawn out plot points that were more nimbly handled in the book. The series kept some things vague and generated extra drama to keep you watching. The book focused on other things. Both were good. I enjoyed the series enough to want to read the books. But I liked the book a bit better.