My favorite storyline in the movie was Carmen's, which is funny because I liked her the least in the books. I loved her and Ian together. Out of all of the stories, hers seemed the most complete.
Even though they tried to cram so much in, I like the movies better than the books because I like the girls personalities better. They seem nicer, less self-absorbed than they do in the books. That may come down to poor writing, or the fact that these books are aimed at teenage girls and I am not their target audience.