Favourite Horror RPG
I’m going to go with Sorcerer by Ron Edwards.
This is a tough one, as I don’t think I play straight-up horror RPGs all that often, leaning toward urban fantasy and “heroic horror” genres like Buffy and Hellboy, And it’s weird to classify Sorcerer as “horror”, because it’s not horror in the classic RPG, “investigate/fight monsters” sense.
Still, Sorcerer is very much (maybe literally) about confronting inner demons (and outer demons, since summoning and handling them is the whole point). It’s about the price of power and the horrible things we’re willing to do in payment. So, it’s not oogy-boogy-spookum horror, but “Oh, my God, what have I done?” horror, which is a lot more appealing to me.
I’ve read the rulebook and the supplements a few times, but I’ve only played it once, a great session run by Ron as part of the Kickstarter for the annotated edition (thanks to MadJay Brown for inviting me). I’d love to play some more, much less get around to reading my annotated edition. This is a powerful game. It’s also an indie classic, one of the Great Games™ of our hobby, and I think everyone should at least read it (and its supplements), if not play it at least once.
A (distant) runner-up for this topic would be Call of Cthulhu d20. Yeah, I know, lame. Whatever. I honestly consider this a good d20 design, frankly an improvement over the original BRP version. I’ve had fun both playing and running it, and it always makes me sad that Chaosium did pretty much nothing to support it. It’s maybe the only stripped-down, low/no-power d20 design I’ve seen, and, for a d20 game, it works pretty damn well.