There is lots of ambiguity here. Depends on how you hit it, etc.

Roof landings don't always end well -- my Civic was trashed when a deer basically bounced up and collapsed my roof on the passenger side. My head would have been trashed as well had I been a passenger!

In general, if you cannot stop, hitting something head on is the best bet. Modern cars are designed handle that sort of collision with maximum passenger safety.