Idk

I hate to be that guy, but... Demon slayer is mediocre in almost everyway except for animation. The characters are almost all ass, the plot is generic, and the villains aren't even good either. One piece is on another level. Another thing is that, most of the time, Demon Slayer fans like demon slayer because it's their first anime and they've watched nothing else. No doubt that demon slayer is a good starter anime, but it will never beat One Piece.