It all comes down to fact that book has more time to develop the story and characters and has more time for you to experience the settings, the characters ETC.
A book makes you feel like you actually there if a book is well written it makes you connect with the material.
A film to doesn’t do that most film are only two hours long so they don’t have time for the depth.
Books are easily better than their adaptations but there a rare cases like Forrest Gump and Jaws