i think that Armed / Unarmed style is far superior to either of these two in separation.
We can attack with arms & legs, keeping a knife as an 'assecurer' - using only if neccessary.
That way we can employ nonlethal methods easier.
If we have to fight lethally it's also an advantage to have more options.
If neccessary we can also punch with the knife-hand, we just need to switch grip into seiken around the knife's handle & move knife sideways to not thrust or cut attacked person - for example.
There are more nonlethal moves with the knife-hand/forearm/elbow, many of them not requiring knife to touch the target, even if it's held in the clenched fist.