Ninjas Are Better Than Pirates That could be a good topic for a comedy debate.
As for a _letter_, you'd normally be sending a letter to a particular person you probably know and be discussing things of mutual interest. This might be a bit odd, but I guess you could be trying to convince your addressee of your position.
As an _essay_ title, it depends on your teacher and his/her attitudes. You'll probably produce a more interesting document if you really like your subject, so my advice is that if you think your teacher is broad-minded enough, then go for it.
Ninjas and Pirates hate each other because pirates eat rats and ninjas eat humans/cats/mouses
Yes, but I believe they can overcome their differences and help the world and WikiAnswers.
Pirates vs. Ninjas Dodgeball happened in 2008.
pirates
Pirates vs. Ninjas Dodgeball was created on 2008-09-03.
because pirates only use brute force to get what they want but ninjas are just cool
Pirates like gold. Pirates do not like Ninjas.
ninja
NINJAS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ninjas vs- Pirates - 2007 was released on: USA: 3 November 2007 (Melbourne Independent Filmmakers Festival)
NINJAS are better
Ninjas