I have never been in a real knife fight. I did have a girlfriend who was 'pretending' to stab me with a knife, my instincts took over and I blocked and got stabbed in the hand for it. (She is now an ex-girlfriend.)
All of that being said, I would think the Hell Raiser to be the fighter of the two. It looks like it would be much easier to sharpen the swedge on it, in effect making the point similar to a broad double edged dagger. This will be brutal for back-cuts but does not lose anything in any other 'attack' form.
That being said I like the Jackhammer better. I think of it as a top class utility field knife that would also double well as a fighter, where as the HR, to me at least, is a pure bread fighter. I like the shorter blade and overall blade shape of the JH quite a bit better and think its one of the overall best looking blades Busse-kin has released in a while.