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Thank you very much. I believe the ninja would win. Why? Because the ninja has nothing to lose. That is his mindset and when you add stealth ability and devious tactics, he is near invincible. The samurai on the other hand has too much pride, honor and reputation at stake... too much to lose whereas the ninja, an outcast in society has nothing nor needs anything but everything to gain.
By the way, I like your artwork. I'm following you ;)

I can't argue with this explanation, lol.
Thanks, followed you back :)