I've done both of these (on dirt and ice). "A lowside crash is usually less damaging than a highside crash" is one hell of an understatement. With a lowside and wearing the right gear you might end up a bit dizzy from tumbling, with a highside you are launched into the air and as soon as you land you have your entire 200 kilogram bike tumbling towards you. I've been lucky and been uninjured every time but you can really picture a lot of damage being done by having the thing land on top of you, even if you dont hurt yourself when you hit the ground