I should really reread this collection -- I have the same copy as the image in your post, though mine came from a thrift store 20+ years ago and is in much rougher condition! I remember really liking it, and I still remember several of the stories, even though I don't think I've reread it since I was around 15. (I was actually just talking to someone about "Quitters, Inc." the other day. It's true that it's kind of a one-liner, but I still find it really interesting, I guess more as a sort of commentary than as horror per se.)

I'm one of those people who tends to prefer King's short stories, I think because to me the short stories usually seem to have more solid endings, and I think maybe they also seem creepier to me because they're a bit more generalized? But I don't know, I'm working off of an extremely limited data set, because the only piece of fiction that has ever actually scared me was one short story in Skeleton Crew, so I guess by default I assume short fiction is scarier, even though it's really just that one story. XD