In the event of a crash over thick snow or a forest, would it be safer inside the aircraft or free-falling?
Statistically, there has got to be graphs you can combine to show the number of airplane crashes to fatalities and a graph with skydives (without a chute/malfunctions) to fatalities. I'd venture to say that the odds are far greater to surviving an airplane crash than a freefall.

Let's look at the factors...

A freefall:


your velocity in not slowed by anything
your body is not protected by anything
you have no control on where to 'crash'


A crash landing:


passengers are slowed greatly by the aircraft
passengers are greatly protected physically (airframes are designed to minimize risks from explosions, shrapnel, and crash G's)
there is a greater chance the aircraft can be controlled somewhat to crash in the best place.


The only time it would be better to jump without a parachute is if you are this guy or the aircraft is about to be torn apart.