Let's compare.
Shadow Temple: creepy music, deep chasms, invisible platforms, voices talking of bloodshed and evil, blood on the walls, drums playing in the background.-->Creepiness:9/10 (1 point taken off for it being less creepy during the day)
Earth Temple: not so creepy music, light puzzles lighting up the dark atmosphere, having a companion with you to reduce the feeling of loneliness, redeads looking clownish, the whole cartoonish atmosphere, an odd boss.-->Creepiness:2/10 (2 points for the death theme and the wallmasters)
So, all in all, the Shadow Temple. :ganondorf: