I hope you know, Yondaime can instantly appear anywhere without any warning whatsoever. That means One Piece characters would be dying left to right. Couple that with the fact that the demons would be in the battle, Naruto can go four tailed kyuubi giving him unfathomable power, Sasuke's CS2 giving him power that is on par with Naruto then he has Sharingan fully mastered giving him an even freater edge, Rock Lee and Gai's six gates, and Pein's tremendous that can devastate the world if he so chooses. There are even more stuff to worry about from other Naruto characters. One Piece do not have a chance against the Naruto characters.
What chapter did it show that Yondaime can teleport? Kakashi's past arc?
I know Minato(Yondaime) has the ability to appear instantaneously anywhere though isn't that through the special Kunai that Minato gave to Kakashi? Other than that, He has Body flicker which increases the users reflexes and allows users to travel short distances. Sounds like Soru to me. Shicibukai Bartholomew Kuma too has the ability to teleport himself or other people to anywhere he knows, sees or has been to. Besides, most OP characters considering Kaigun(Marines) admirals and their army, Shicibukai, The Revolutionary Army lead by Luffy's father Monkey D. Dragon, Gol D. Roger who was the Pirate King, Whitebeards Fleet and Divisions, Blackbeard Pirates, Strawhat Pirates and many others I forgot such as Elbaf Giants. Oh yes, did I mention Enel is in the battle also along with Gecko Moria, Oz and the whole of Thriller Bark.
Even though Naruto is considered a mini demon fox in 4 Tails, All it showed in the chapter was him being stationary, sitting in one place, blasting a giant cero-like beam. He is slow in charging the blast and is a sitting duck to attacks from many powers.
Though, in gaining unfathomable power, he is quickly but surely dying due to the affects of 4-tails. Besides, what do you think that Naruto would be able to activate 4-tails before he gets killed by a logia, like Blackbeard, or someone that I mentioned above excluding Ussop, Nami, and Robin. Chopper is unsure because of his Monster Point which hurts him but makes him temporarily invincible like Giga Bowser from SSBB. Besides that, it's not like the demons are invincible to attacks, they can get hurt meaning they can get freezed by Aokiji, disintegrated in a matter of time by Enel, crushed under gravity by Blackbeard, or even matched up against Zombie Oz(He can't feel pain nor can be poisoned).
CS2 Sasuke...Really, maybe you didn't read One Piece. Sasuke, as in my opinion is probably greater in skill than Naruto, seeing how he eliminated Orochimaru with ease and calmed the Nine Tailed Demon Fox. Though, he may have Sharingan, Enel who can destroy islands can take on Konoha with ease can literally char Sasuke to a crisp. Blackbeard, who too can destroy villages, is a walking black hole.
Rock Lee's and Gai's 6-gates are just an imperfect variation Gear Second. Luffy, along has the ability to pump air to speed blood circulation at a faster rate without putting strain on his organs. The 6 gates are similar but are imperfect versions. Above that, there are minimal damages in Gear Second compared to 6 Gates and Lotus. Besides, if you can prove to me that Gai and Rock Lee can break through many layers of bedrock in their base form (Not concrete! Bedrock.), then you can say there 6 gates are on par with Gear Second.
Pein's tremendous that can devastate the world if he so chooses.
Might I say, Pein's Rinnegan, which said can devastate the world if he so wishes to is similar to Sharingan. It has the ability to use all types of elemental techniques and elemental chakra. Devastate the world pretty much falls under it but not destroy it. Just because he has Rinnegan, doesn't mean he can literally implode the world to doom or wipe out a whole civilization. It probably means he can use Water Ninjutsu to drown islands, or create small scale Isles. Rinnegan
created the ninja world, not the actual world thus doesn't give god-like status to Pein like how it applies to Enel, and created the first ninjutsu. Rinnegan doesn't have end of the world abilities and so does Enel. Though, Enel can create Raigous which can be end of the world attacks.
There are even more stuff to worry about from other Naruto characters. One Piece do not have a chance against the Naruto characters.
There are more than the strawhat pirates to worry about. Such as Aokiji, CP9, many other Logias, Thriller Bark Zombie Army, Shichibukai, Whitebeard Pirates and so on.
Oz of course, is powerful but only if he has Luffy's Shadow and has Moria controling him. Though, in his past life he controlled countless countries he conquered but was stupid enough not to wear clothes and die of frostbite.
As seen for the anime standpoint. Let's examine our main characters.
One Piece: Monkey T. Luffy.
Pros: Streching powers, captain of ship.
Cons: Inabilty to swim, annoying tendicies, laughs at inappropriate times, obsession with a straw hat.
Naruto/Naruto Shippuuden: Uzumaki Naruto
Pros: has demon sealed inside him which offers a large variety of abilities both superhuman and supernatural. Can walk on water. His jutsu include the Rasengan, Kage Bunshin, Summoning. He is a member of a large village of elite ninja with abilites equal and greater to that of his own. This abilties can range from turning invisible to cutting a waterfall in half.
Cons: Due to a badly done translation, has the irritating catch phrase "Believe it!" in the English anime. Some comedic relief can be childish or irrelevent to American viewers.
Based on this, I will have to rule in favor of ninjas. I will further update, using several different mediums as evidence.
And that was just saying ninjas are better..............................
Your standpoint has too much holes. It's like you're making red wine with rice.
Right now, I am assuming you guys are up to date with both manga One Piece and Naruto Shippuden. Hopefully, I am right about you all reading both of the manga and that I am not being biased.