I do have One Piece above Naruto/DBZ as a story. However, if it cant even beat the popularity of its peers worldwide, how could it to become a historical masterpiece?
Argue against Oda fool =>
I'll take numbers, over opinions.
I'll give it to DBZ though, it's the OG iconic series that got everyone hooked, and if it had more volumes, it'd definitely be top tier in sales.
Naruto on the other hand could double it's volumes to 144, and double it sales to 500 million, and still be less than One Piece at 106 volumes, and 516.5 million sold.