Fanfiction to both. I do have a few original story ideas, but for now I'm content making stories based off from other media as I have the world and characters for me already. I've been trying to get back to reading books though, the last ones were the Crazy Rich Asians series. I thought up of a few more books/series I want to get into.
I do Fan Fiction and I'd say 99% of the time it takes place in the wrestling world. I've thrown my pen in once or twice trying to write a Pokemon fic waaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay back in the day.
fanfiction! I love writing existing stuff. mostly because I'm not the most creative with thinking up brand new things, and I like to challenge myself to write existing characters and see how well I can keep them in character :D
Fanfiction, mainly. I do write fanfics most of the time, and have written a few Pokemon stories as well as some for other series.
I have however, had this original story brewing in my head for quite a while, but I haven't been able to translate it to paper quite yet...
ISO Standard commentary to the effect that there's not really much difference between "original" and "fanfiction" except who has lawyers to support their case. Just look at Disney.
That said, I mostly read into "alternate history AU" be it fanfiction or original (though under the above constraints is that a genre where anything can actually be said to be "original"?). For writing, well, I'm here no?