I don't have a special kind of film as my favourite. I sometimes I enjoy drama or comedy or action films and so on. The important thing is the quality of the film, the story, the performance of actors, the direction, etc. I liked very much comedies as "The Pink Panther" but I liked also films as "The sixth sense".
If I have to recommend a film I liked very much it is "The Illusionist" a drama with a lot of mystery written and directed by Neil Burger and starring Edward Norton. It tells the story of a magician at the beginning of the 20th Century in Vienna. I found it fantastic