The key to its success is about a protagonist who looses everything but stands up and tries it again but nevertheless fails, at the end he looses his brother.

This is unique.

And it has impressive characters like Whitebeard or Ace himself. Unlike Wano.

This is the 1st time we explore the big ones of the OP World. In Wano, they have been flashed out, but are less impressive because Oda failed. Something Artur doesn't get.
The emotional impact of Ace's death was so powerful that I cried a bit even if I didn't care much for Ace before, not to mention WB was a true legend through and through. Nothing in Wano comes remotely close to that no matter how hard Oda tries to convince people otherwise
 
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