Last comment.. if I had ever gotten around to making this I probably would have gone with Rotten Tomatoes over IMDB.. then I could have included Alien and Aliens.
When it comes to determining which film is better, I trust imdb more. Some movies like the Toy Storys just have incredibly high ratings, and I just looked up the Lord of the Rings trilogy - according to rottentomatoes, The Two Towers is the best of these, with 96%.