The first creepy cuz of the "WHAT DO I DO?!" aspect (LOL Markiplier totally freaked out), but the jumpscares in the second were scarier, plus the new death minigames.
In the first game it went like this: "oH GOD I HAVE NO IDEA WHAT I'M DOING HELP TOO MUCH LORE". In the second installation it went like: "oH GOD I KINDA HAVE AN IDEA WHAT I'M DOING HELP WAY TOO MUCH LORE TO PROCESS AND THIS THING HAS GAINED QUITE A DISTURBING FANDOM". So...
Both are equally scary because in the first one you do not know whats coming but in the 2nd you know whats going to happen, but there are more jumpscares.
In the second installation it went like: "oH GOD I KINDA HAVE AN IDEA WHAT I'M DOING HELP WAY TOO MUCH LORE TO PROCESS AND THIS THING HAS GAINED QUITE A DISTURBING FANDOM". So...
(Insert jumpscare.)