Personally, I believe Naruto's strengths lie in its well-structured combat system—fights aren't just mindless brawls but logically crafted within a defined framework, with details that hold up under scrutiny (though the power scaling did get shaky later on). Additionally, the character designs are visually refined. Objectively speaking, it surpasses One Piece in these two aspects—even though overall, I still prefer One Piece

While Naruto's combat system and character designs are indeed commendable, One Piece's world-building and storytelling are unparalleled. Each series excels in different aspects, making it a matter of personal preference.