I assume you're reffering to Joe Musashi.Their were multiple Shinobi's.Anyways this would be a very good fight.Ryu's main trait is his melee.Shinobi uses his tremendous speed and long-range attacks.Compaired to Ryu he lacks close-range attacks.Shinobi is also known to have mystic powers.Such as Invisibility,Increased movement abilites,he can also summon a fire storm.The only way I can see Ryu winning is engaging Joe in close range combat and fast.Seeing that joes speed is far superior than Ryu's Joe wins.