As much as I want to disagree with you on the movie part, I can't. Twilight [the movie] is a great disappointment - I don't need to go through this argument again x)
However, book-wise, I think that Twilight and its sequels are better than Harry Potter's. To me, Harry Potter would be amazing in theatres but not by reading the books. Twilight, however, I can picture with without much difficulty. I don't know - that's just my opinion.