As a filmmaker, I tilt towards stories which are crime-led.
I love songs but am inhibited to have my characters burst out to express themselves through songs. I use the route of using old songs at the right places.
It is unlike the quintessential thriller where someone is up to something and the audience is speculating. 'Johnny Gaddaar' is the opposite of a thriller. In this case, the audience knows right from the outset what transpires and who the likely culprit is. It is a suspense caper.
On a serious note, I just enjoy exploring the unconventional. I like Alfred Hitchcock; I actually grew up watching his films. A thriller gives you much more scope of exhibiting creativity in terms of playing with the camera and sound, as against a typical love story.
Right from childhood, I have enjoyed films which belong to the thriller genre. As a kid, I would read novels written by Agatha Christie and James Hadley Chase.