this is the question which you can’t find answer unless you watch both of them yourself but as a guy who watched both of them i’ll share my views ..!
let’s talk about “NARUTO” first .,
naruto is about a kid who lost everything including his parents but chose to live as one of the good guys ., even though he’s stubborn and mischevious he always chose the right side …!
even though everyone hated naruto ., he didn’t choose a violent path instead he aimed to become hokage just to gain respect of everyone in the village and ended up earning respect of the entire world ..,, i mean that’s one hell of a dedication .
naruto has a great story line with a matured plot , we all knew that naruto is going to be hokage at the end right after watching the first episode but that doesn’t let you hurry for the end, as the show goes on you’ll love every aspect of the show well except some fillers .., if anyone says naruto is a great show with a huge pile of bad fillers then he/she might not have watched a lot of fillers ..! yes it’s true that there are some really bad fillers but which anime doesn’t but i’ll guarantee that half of them are really good..!
the greatest thing about naruto is it doesn’t just run around naruto each and every character has an important role ., naruto is famous for it’s storyplot which leads you to a surprised twist and then reveal everything we have missed..! naruto has a large number of great characters like kakashi , itachi , shikamaru , sasuke , jiraiya , obito .., i can go on and on but i assure the list would be close to 50 by then ..,
i mean you gotta love sasuke’s epic lone ranger stage , shikamaru’s wise words , kakashi’s coolness , jiraiya’s epicness etc..,
naruto is one of the greatest long anime ever there’s no doubt about it but the only drawback is filler placement , there are fillers throughout the series but they didn’t seem relevent to place them at the place they had placed ., and the shinobi world war feels like it’s dragging but when naruto enters the battlefield it gets really serious and just when you’re enjoying everything little thing about that war they hit you with fillers so hard that you won’t be able to enjoy those fillers .., it’s a good thing i skipped them and watched them later i finished the series .,
my rating :- 8 / 10
now let’s talk about “ONE PIECE” .,
it’s about a guy who wanted to become a “PIRATE KING” .., i bet that everyone would think that he’s going to become the so called pirate king for sure as he’s the main character of the show but as the show goes on you’ll doubt that if he could become pirate king or not but then you’ll become sure that he would become pirate king for sure ., that’s the beauty of one piece it will always keep you guessing ..,
i bet 70 percent of one piece would agree with the fact that they truly believed in luffy about becoming “the pirate king” right after “ENIES LOBBY” arc .., until that arc all luffy did is fighting with his stretching abilities which might make you enjoy but “it’s not enough to become the pirate king” i’m sure this is what everyone thought but when luffy used GEAR – 2 & 3 it blows your mind that luffy just improvised his technique and got stronger in mere seconds ..,
and the thing that i admired in onepiece is the concept of bounties ., bounties are given to the pirates based on their threat to the world government ., i can still remember every moment when the straw hats got a rise in bounties …!
bounties of luffy from the start ..,
the current bounties of the strawhats
the best thing about luffy is once he decides something he never backs off and whatever luffy decides , i mean how dangerous it might be there’s a guy behind him who is the badass character of the entire one piece universe and his name is “ZORO” ., the man who wants to become the world’s greatest swordsman .., there is a huge list of one piece characters who are great and the storyline , plot , action .., everything is perfect about one piece ..,
you’ll love everything about one piece ., i mean everything …! the best part about one piece is it doesn’t get repetitive like ever and the fillers are good too ., you’d get to watch new characters every arc as it’s a journey of emotions and when i say journey i mean literally ..!
unlike many shows the protagonist in one piece is not the strongest one ., if you think about it he might not even be in the top 30 strongest characters in the one piece world but his policy about getting stronger is the one that will make you fall in love ., he wants to get stronger because he doesn’t to lose his friends ., luffy is the character you’d be obsessed with and for those who didn’t watched one piece yet i definitely recommend it ..!
my rating :- 8.5 / 10
for your kind information i love both the shows equally but if i have to pick any one of them i would have to pick “ONE PIECE”