The 2003 version included more details from the book then the 2018 version. The characters in the movie also had the closest lines to the characters in the book. The 2018 movie did a good job at the effects and making everything pretty but they brought in most of their own ideas into the movie. The settings in the 2003 movie also had closer settings. In the book it talked about how the characters went to Ixchel and saw furry creature things. In the newer movie it barely showed Ixchel and they had never came in contact with the beasts. Ultimately the 2003 version was way closer to the book than the new 2018