I liked him in both although Cedric is more approachable and was the popular guy in school, the jock, the one who dated every girl in Hogwarts, ( somewhere Hermonie is kiciking herself) Edward was just someone you stayed away from because he was soo intimatiding.
I have to admit that when I first saw Harry Potter and the Goblet of Fire, I didn't like Rob.. but that was only because he had to compete with Harry and I was a huge Harry Potter fan. But yes, he played his role very good and I understand why after Harry Potter people started to call him 'the next Jude Law'. But I do prefer him in Twilight, though.. he is one of the main characters there and he has really grown since Harry Potter. He was really good there, but now he is even better. Let's say that Rob is just a fantastic actor and he's good in everything he does!