Cupcakes scared the crap out of me. Rainbow Factory is still scary but cupcakes is the worst for me.

I honestly think Cupcakes is a bit overrated and it didn't even scared me, Rainbow Factory wasn't even that scary but it was still good and way better than Cupcakes.

For me some parts did while others did not
and sorry for the repeats the question was to long

Well, I never actually got fully scared by that type of stuff, but They are both just so friggin awesome..

I always love reading Grimdark's. I also like, the experiments of Twilight Sparkle

I think the CONCEPT of Rainbow Factory is... well, I wouldn't say scary, but unsettling at least. It's organized mass murder, with an entire apparatus built on it, enginereed by the pegasi... it's... cleverer than Cupcakes, which is about random acts of mindless torture and slaughter more or less.

Rainbow Factory = 0% scary... My opinion!

It's Cupcakes, gives me the chills. Not rainbow Factory, sorry if that answer pops up instead of Cupcakes. Cupcakes is TERRIFYING, SCARY, HORRIFYING AND SCARY AND TERRIFYING AND CREEPY AND ALL THAT... and Rainbow Factory is a simple and very clever story, while Cupcakes is a terrifying and extremely violent random story that is just about Pinkie Pie going like "Oh, somepony has cupcake then Pinkie kill them with knife" Yeah, not radical, dude, I've watched all the videos and I feel like I wanna screammmmmm, then have boredom as I watch Rainbow die. Seriously, boring and scary at the same time, and also kinda sad. Hate you Cupcakes