What's easier for you to write?

When it comes to fanfiction (and to writing in general, really), finding out what is easier for you to write is important, because it affects how much you produce. If you like writing romance, you'll have an easier time when you focus on that genre, for example.

Something that also helps as far as fanfiction writing goes, is how much you like the property you're creating a story for, if you really like one franchise it will be easier for you to write for it. Another thing that affects this is if you like the idea you're developing; the more you like it, the easier completing it will be.

All of that affects production.

In my case, I have tried many genres, going from action to comedy to romance and horror. I've found that most of my stories tend to gravitate towards a mix between action and drama, but family themes and elements of what some people would call horror tend to appear in my writing from time to time.

Thinking of it, I believe I have an easier time when I focus on ideas rather than genres, because that means I can plot the story beforehand.

In the end it's all about finding what works best for you.