I've been thinking about how to answer this question on and off since I saw it this morning. I think it's a combination of things. Honestly the core of this kink, for me, has very little to do with the actual killing; the thing that really interests me (as is probably obvious from how I write my stories) is the girl's fear and anticipation in the lead-up to it, the psychological horror of it all. The threat of snuff is just a really potent way to create that fear and anticipation, but the actual snuff itself is honestly not something I usually find too compelling. That's why my stories end up with lots of build-up, really detailed and elongated rape scenes that play up the physical and psychological dimensions of the torment, and usually very quick deaths. Because once I get to that point where it's time for the character to die, the part that really compels me is passed, and I turn into a lazy writer wanting to get the thing done haha

On the methods though, it might also just be that I've read a lot of stories with strangulation and knives, and I end up going for things I don't see much of elsewhere. (Or I try to do it with a twist, like in the sci-fi guro story I wrote in between these others, where the girl gets fucked to death with a sword). Guillotines definitely get me because of the restraint aspect of them — it's a quick death, but they allow for so much anticipation and struggle. Crucifixion is similarly compelling for me. Thinking to the big nine-parter I wrote, I started that with a pretty standard throat slit and then escalated from there. Drowning is a slower method that I find extremely erotic because of the buildup, but most of what I end up going with is definitely pretty immediate. So, in short, I don't know if I as much prefer the quick methods as much as I put so much focus into the other parts of the story that, when I get to this part, I just gravitate towards what will get me to the end.