1. Ninjas and Pirates have to at least break a sweat to disarm each other. A Jedi Knight just has to think it and you're screwed.
10. A ninja may try to sneak up on a Jedi, but a Jedi Knight can sense danger through the Force. A Ninja doesn't have a chance of using stealth.
14. If a Jedi loses a limb, they get a robotic replacement. Pirates just get a wooden stump that somebody ripped off from a rocking chair. The last ninja who lost a limb is still stuck in the tree he was hiding in because he can't climb down.
5. Dress someone in a pirate or ninja suit and they look like they're in costume. Hand someone a lightsaber, and a cloak, and they look bad-ass.
13. How many ninjas and pirates do you know of that achieve immortality in the form of ghostly spirits? That's right, not only can Yoda kick your sorry ass, he can also haunt your sorry ass for the rest of your life.