Although you can have some nasty scratches and bruises from them both, skeleton is way less dangerous when it comes to head injuries so I'm going with skeleton.
K
"Skeleton, it’s faster, and you can see where you are going (and your likely imminent death)
Actually it's slower than both luge and bobsleigh
LvM"
Happy to be wrong, but thought it was the fastest, which is why it’s measured to the Thousandth of a second not hundredth?