Would you say that the horror genre is harder to pull off in printed media and animation than in live action?
I always had an issue with the genre of horror in printed media such as novels (The Turn of the Screw) and comic books (Hellboy although I do enjoy the lore Mignola establishes for his saga). I have notable exceptions such as H.P. Lovecraft but mostly because of the ominous and horrific fates that happen to his characters that are implied on the page. Horror in printed media never really makes me as tense as when I'm watching a good live action horror movie or television show such as Mike Flanagan's The Haunting Of Hill House. Somehow the atmosphere music creates (or the lack of sound) and a character with a limited view of his or her surroundings being portrayed by a real person builds more tension for me than printed media ever could.
Honestly, I think it's more of a cognitive thing than anything else. My senses being more engaged of a concrete concept than something written or drawn on paper.