I personally not into Mafia stories or cliche romance story, but it depend on what do you want.
Do you want to create a story for yourself, according to your “world” version of you(Like you are the creator, you are it’s story God, you can create a story about something that exist in our world but in different reality and such" according to your own taste.
or
You can write a story that people wants. If you don’t care about what people want to read, you can always create a version of a story according to what you really want ignoring other’s, but not many people will read that, but if you want your story to be liked you need to write it in people’s taste even if it doesn’t really suit you.
I personally like a happy ending, but not for the bad guys. A story doesn’t have to end in happy ending though. Some sad, touching stories can be from a sad ending as well.