Uhmmm...I've been under the impression that the BK-5 was the Magnum Camp?
My first vote would go towards the BK-5, with my second vote cast towards the BK-9.
Between the two, it comes down to technique. I've had to spend a helluva lot of time getting to where I could thrust as accurately as I'd like with my BK-5, and just don't feel it's a very inherently accurate thruster. (my standards aren't that high, a designated half of a playing card at full speed satisfies me fairly well for now) But with that wickedly thin, sharp blade it's one helluva slasher, and very quick in the hand.
Even though I've never owned one, (handled a few) I feel that the BK-9 would be more accurate for trusting, given its tip location, and it probably don't give up all that much to the 5 in slashing ability either.
In real world instances that Patrol Machete looks positively brutal, but I figured it does escape the "fighting knife" designation a bit.
Although all this being said I wouldn't choose any Becker without having the handles worked on. Thin 'em down, bead blast 'em, take the slabs off and cordwrap 'em, whatever. After spending several hours with my BK-5 I came to feel fairly adamantly about that. Bear in mind, the handles aren't a flaw in design, they do just what they're supposed to do, which is be comfortable and reasonably secure for prolonged hacking and usage.