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This will be more of a comparison than a review. To start off, I prefer the show over the book.
There were creative choices made for the tv series that helped the audience humanize Joe and it's just a personal preference that I like my villains complex with personable characteristics mixed in with all their evil-doing. Most of the show remained accurate to the book, but almost all of the additions made for a better story. For example adding Paco's character in was a good change, but adding Candace's reprise was meh. I haven't started the second book yet, so I'm not sure if Candace will indeed pop up, but I hope she doesn't. Penn Badgley captured Joe Goldberg perfectly, and Shay Mitchell's Peach was a million times better in the tv series. I didn't like either Beck so it's hard to compare the two. I loved the references to literature because I have read and strongly disliked most of the books Joe recommended that every “well read” dude suggests. All of them have undertones of misogyny, racism, or are simply pretentious af. I especially liked the criticism for people obsessed with King novels. (Still hate his writing.) These references helped me map out who Joe was on a deeper level and understand why he, as a psychopath, would relate to these books. The biggest feeling crossover from the book and the tv show is my love for Karen Minty and I'm so glad she got out. The only Karen I'm okay with relating too. I loved King of Queens.