CapitalizedLiving
Welcome to the Bladeforums. What do you mean by saying "use in actual combat"? Do you mean to say from the perspective of a soldier, a G.I.? Do you mean it from the perspective of some street confrontation? Or, maybe from the perspective of someone who wants to stake another person and kill him with a knife / sword?
The reason I am asking this is that in every case the implement of choice can and should differ greatly for quite a few reasons. For instance, I doubt whether the guys down in Iraq can carry an AK-47 or, a Ruck Kensei for that matter. Further to that, try to fight an opponent when you can sense his breathing and you will see that neither of these will serve you well because they are too large. Don't get me wrong here, both are fantastic swords but not suitable for core-a-core blade fight. There you will need something that you can move in your hand with the speed of light, otherwise kiss this world goodbye! There, you will need something like a Satin Jack Tac. A War Boar can serve well too but, it's not as versatile as the Satin Jack Tac. Concerning either the Hell Razor or, the Mud Razor, they are nice general purpose knives but more difficult to maneuvre than the Satin Jack Tac. The ST-56 is also a very good choice. I have owned these knives and have experienced their handling, it's not words by hearsay.
On the other hand, if you mean it from the perspective of a street melee, like in the movie "Gangs of New York", then both of them (the AK-47 or, the Ruck Kensei) will make exceptional choices. If, on the other hand, you mean it from the standpoint of someone who wants to stake another person and kill that person with a cutting tool, then in addition to the above one can also choose any of the "bad" choppers: the FSH or, the FBM versions.
My $.02