The Story of Your Life
One thing my grandpa noticed as he walked out of the theater once seeing The Arrival, was that you could ask 14 people, and every single one would have a different interpretation of the movie. And this couldn't be more true. The decisions made by the producer to prolong the knowledge that came with Hetapod B allowed the audience to consider what was happening throughout the entire film. And without having read the short story, I would have no such clue as to what was happening as well.
When it comes down to which one did I prefer, I would have to say the movie by a long shot. Even though there were some scenes that I thought would never end, it depicts the hardships that I couldn't have seen in the short story. Such as the impending threat of the other high power countries and the rouge soldiers. Or even the knowledge of having a daughter. I just couldn't see those while reading the short story.
One of the main differences I saw between the movie and short story was the difference of 12 years and 26 years, (I don't want to spoil what this means but you will know once going through both). It made the decision at the very end so much harder as one is a good age to live to while 12 is much too young to die at, Another difference would be the communication they had with the hetapods. One was through a device and the other was through almost direct contact with a division of glass between them. One similarity that they held between both forms was the advantage of knowing hetapod B. If they were to at all change this, the story would have changed drastically so it was really a must do.
Overall the movie and book were both exhilarating to read, and the film adaption couldn't have been handled better.