I have to agree with CLEAR CUT on the crush injury. They are bad and can really be more damaging then they seem.
A sword in the hands of a practiced, experienced wielder is deadly, regardless of the design. So is the pistol, rifle or shotgun, for that matter.
In the hands of someone who has never used one before (but has seen it done in the movies), any weapon can be potentially damaging to the user rather then the intended target.
As for edged weapons, a shorter bladed weapon seems like it would have less potential to harm a first time user then a longer bladed one. I would only go for my kukri or double edged machetes if a) I was in the middle of reloading an empty firearm and was rushed or b) was out of ammo, cornered, and had no other alternative. At those two points, a long bladed edged wepon would seemingly have to greater value then a shorter bladed one. As for the wakashazi over a machete, both have their strong and weak points (no pun intended).
"All the world will be your enemy, Prince with a Thousand Enemies.
And when the catch you, they will kill you.
But first they must catch you."
-Richard Adams, Watership Down