While it is true that ninjas are freakin' awesome when it comes to using things like teacups and hadoukens for weapons, they lack style (and cannons). Ninja's are a dime a dozen, because they are all the same. Pirates, you can choose, the eyepatch, the parrot, the monkey, the peg leg. It's all about the accessories and what you want to be.
Besides, they are rich.
Pirates also have really cool hats.
Ninjas kill themselves if they make a noise.
This argument has been had before, and the pirates lost then too.
The primary reason is that pirates have scurvy, smell bad, and are ugly.
To refute your arguments:
-"Ninjas area dime a dozen"
You've obviously never shopped for quality ninjas
- Ninjas "are all the same"
This is only an appearance thing, and it is an ADVANTAGE. Not only do you have the cold social acceptance of dressing like your peers, but you can't be identified, at all, in a police line up.
-The pirate accessories
Each of the things you mentioned is required to cover a disability, except for hte parrot, which will only repeat something you said at the wrong time and take a crap on your shoulder. The monkey on your shoulder is an undercover agent for the ninjas.
-Pirates "are rich"
Only for very short periods of time, after which the money is spent entirely on grog, making the pirates even more disgusting in their filth, drunkeness and lack of discipline. Not to mention easier to kill.
Ninjas don't need the money, anyway. We have everything we want. And if we want something else, we just take it. The original owner will remain unaware that he has even lost it for weeks.
-"Pirates have really cool hats."
Those hats suck. Everyone says so. At least the people who aren't too busy laughing at your lack of fashion sense.
-"Ninjas kill themselves when they make a noise."
Yet ninjas don't kill themselves, because they *don't* make noises. And, truth be told, this is a lie told to pirates. It's hilarious how many pirates, trying to infiltrate a ninja clan, have killed themselves to keep their cover because a ninja told him he had to kill himself.
-Ninjas "lack style (and cannons)"
I don't even know what you're talking about here. THere is nothing more stylish than a ninja. Unless it is a ninja that is also an assassin priest.
And no ninja has been killed by a cannon. Yet thousands of pirates have died when their own cannons have misfired.
In short, pirates are also stupid.
They are also hunted by legitimate governments. Since pirates operate in the open, they are quite often hunted down.
Pirates have no training. The make their living off hunting ships less well armed than themselves. This is partially because of the training, but is also a result of their very poor self-esteem which leads them to believe (correctly, at that) that they could never beat anyone on equal footing.
Ninjas, on the other hand, can defeat any force of equal or even greater armament.
Pirates have no honor and are drunken, undisciplined slobs. The only women they get are kidnapped. We won't go into the implications of where most pirates (sailing in all male crews) get their release when at sea for such a very long time.