Thriller is a genre of literature, film, and television that uses suspense, tension, and excitement as the main elements. A thriller can cover many sub genres and is arguable that is may fall into specific groups.
Action Thriller - This type of thriller involves heavy action and that would be quick and fast paced film. (The Expendables)
Psychological Thriller - The suspense created by psychological thrillers often comes from two or more characters preying upon one another's minds, either by playing deceptive games with the other or by merely trying to demolish the other's mental state. (Donnie Darko 2001)
Supernatural Thriller - In which the film brings in an otherworldly element mixed with tension, suspense and plot twists. Sometimes the hero and/or villain has some psychic ability.(The Skeleton Key)
Political thriller - In which the hero/heroine must ensure the stability of the government that employs him/her.(The Interpreter)
Mystery thriller - Suspense films where characters attempt solving, or involved in, a mystery.(Unforgettable)
Erotic Thriller - Consists of sexual activity and attraction between two people. (E.g. Fatal Attraction)
Conspiracy thriller - In which the hero/heroine confronts a large, powerful group of enemies whose true extent only he/she recognizes.(Marathon Man)
Suspense Thriller - Thriller is set on tension, excitement and suspense, but suspense thriller takes a step further and really gets the audience's heart going. (E.g. Phonebooth)
I have to say in my opinion i believe that action thrillers are my best due to all the heavy actions going on within the movie which is really exciting,which keeps you on your feet plus the tension and suspense within it aslo makes everything so dramatic so as audience you'd want to watch more and stay enaged with the movie.
I literally love 'The Expendables' due to it's such an action thriller which has been directed really well with a great stroy line and fits perfectly well within it's genre.