I Liked 1983 because of how disturbing an eerie it is. it sounds similar to the bloodsuckers of S.T.A.L.K.E.R.

not to mention the term used in the note "bumfuck, USA"

SCP - 087 is my all time favourite because how strange it is... that face haunts me.

1984 is just downright creepy.

I've got three favourites.
SCP-087 - The Stairwell
SCP-1983 - Doorway to Nowhere
SCP-1984 - Dead Hand