>>6165524The Enigma of Amigara Fault seems to be a most known popular one for being the most 'scary'
I never really got nightmares from his stories, they're just sort of sit in the brain for a while and make you think, and come off overall unsettling which I quite like personally
But there are quite a lot of them, so just try out whatever story has an interesting name that you think may get to you
Some I like are The Circus is Here, Scarecrows, The Groaning Drain, Drifting Spores or The Hanging Balloons.