Well, as Sarge said, the WWll is more versatile- a well balanced khuk, capable of clearing brush, fighting, and chopping wood. The web page says 'bando' experts prefer it for it's balance. The Chiruwa AK is designed to chop wood. The photo above says it all. Beautiful beast. But at 16.5" or so, and probably around 28 ounces, (like the 18" WWll) it is still light enough for field carry, and the shorter length more convenient that a 18" khuk. The AK has a wide blade, swelling somewhat towards the middle to tip, and the weight forward helps chopping.
Could your chiruwa Ak defend your life? Of course it could. Probably not quite as fast as the WWll, and markedly slower than the 16.5" WWll. If you are going to get a WWll, I'd go 18" .
The thing is- both of them are real winners. Don't worry.
munk