[jyl]

I have occasionally thought about this question or variants on it. When I was younger, my answer was "with" because it would slightly decrease the relative speed on impact. As I get older, I lean to "against", because you have some ability to see and maneuver, and thus fight against your death.

It's kind of like would you choose to crash as a passenger or a pilot, to die as a gladiator or on the gallows, to be blindfolded or not for the firing squad.