I have never really thought about this. I typically write what ever comes to mind and whatever genre that is but i lean more toward sci fi and horror. Maybe I should try to write outside my box and see what happens.
Fanfiction: I have the hardest time trying to make the characters sound and act just like they did in the original story. I'd rather write my own. Flintlock fantasy: It's American Civil War era technology meets fantasy world elements. A lot of emphasis on warfare tactics. Love to read it, can't write it to save my life. Highschool: I didn't delve into the drama when I was in highschool and I despise the way upper education is portrayed 90% of the time. I could never write it in the way that would be intriguing to readers. The protagonist wouldn't give a shit about the "cool kids" or do stupid stuff to get a guy. A good way to act in real life, not the most exciting story. Sci-Fi: It's all the world building that has to be done. In most fantasy stories I take ideas from government/culture setups throughout history/around the world. But sci-fi is supposed to be something different than what's come before. The world building is much more in-depth, so I've never really tried it.
Probably romance. I tried writing a romantic scene in one of my novels a few years ago, failed miserably at it. Romance isn't something I can stomach reading either, not to diss any of you romance writers. It's just not my cup of tea.
Oddly enough, non-fiction. I tend to dislike writing school papers, haha. I used to have trouble with argumentative/persuasive essays, still do occasionally.
As much as i love History, i know little to nothing about it. And i definitely wouldn't want to embarrass myself by writing something that's completely false in the history, and put it on the web.
I write the same things over and over, but I don't really know what genre it is. Maybe something like supernatural/magical realism mixed with the ordinary? I don't know. As long as it's a bit unusual and different. I really don't think I would be good at writing thrillers. Maybe it's because I would need to plan(I'm not a planner.) Also anything ... epic(battles, lots of characters, many different places etc.) So much to keep track of. It's difficult writing anything in a small area/place with a few characters. I have enough with remembering a character opening a window. Again, I've not tried writing in most genres.
Romance. "Ooh" grunted Lady Sarah, "ooh, yeah ooh, just like that Terrance, faster, ooh Terrance, keep going Terrance, I love you Terrance, don't stop, ooh Terrance, Terrance." I find that sort of thing awkward to write.
Do people actually say, "Don't stop" in bed? I see this written everywhere but have never heard it. Like, why would I stop? To make a sandwich? Check out the ballgame? Organize my sock drawer?
Science fiction: You have to do a lot of scientific research and I simply suck at science. Which is terrible because I've had an idea for a sci-fi novel for a year now and I don't have the courage to start writing.
I got you! Start with a soft science for your first scifi: some of these include sociology, psychology, or some aspects of neuroscience. This lets you learn how to do research into scientific subjects, practice writing with science as the subject while still developing plot, setting, etc, and you can still make up some stuff because the science is either unproven or experimental.
Fantasy. Yes ,there are a lot of sub-genres. The only time I would consider writing something resembling of fantasy is in horror where the unreal has merit. The real world is interesting enough to me, and I just can't be bothered.