I do work more with darker, serious stories. Though, I feel that's from me watching a lot of 1940s noir/crime films and 1980s horror/crime films. Adding that with reading a lot of Stephen King novels, I have a love for darker stories when it comes to character development.
Trying to understand how someone can react to a certain situation or how they can push through them. I'm a bit drawn to that psychological aspect, and I kinda try to add that into all of my stories. I write horror based in cosmic and psychological terrors, and I write thrillers based in gangsters and crime.
That said, I prefer watching and writing darker stories with emotional/heart-warming scenes and hope. There has to be a bit of hope to balance out that hopelessness. Even if the situation will end in tragedy, having a bit of hope to look forward to or at least implied is what I desire out of my darker stories.
An example I can pull is Carrie from Stephen King (the novel, not the movies XD). Even though Carrie had been ostracized and abused for her personality and abilities, ending in her ultimate death, there was something to come out of it. More people became aware of people like Carrie, and it was definitely hinted that a little girl had the same powers like her; only difference was that her mother accepted those powers, assuming it had bee passed down from her grandmother.
Even though that novel had been dark and unjust to Carrie, knowing people were beginning to understand people with powers like hers gave me hope that someone else wouldn't suffer the same fate.
Those are the darker stories I prefer, and the ones I hope to replicate in some fashion. 