The creepiest uncut death . . . (POSSIBLE SPOILER)
In my view, it's definitely Hollis' death. First, the way the shot from Hollis' POV get blurry as the nails are fired in is very effective -- like you are living it. Second, the death is much slower and more deliberate. Third, the music in the uncut scene is very creepy. Fourth, the shot of the miner standing there aiming the nail gun right at the camera speaks for itself.
My 2 cents . . .