Why do some people think One Piece is better than Hunter x Hunter? One Piece is barely good. Like what did One Piece have that's great? One large battle that people keep jerking off to? That really wasn't all that great either in retrospect.
It also feels like all the One Piece characters get backstories written retroactively, and there really isn't anything planned. You guys just fall for it being planned when it's all retroactive backstory. For example Sanji, do you really think when he was introduced the author had any of the Germa shit in mind? No. No he didn't.
With HxH it feels like everything is intentional and all the backstories of the characters are known as soon as they're introduced, and the author isn't just retroactively trying to make them flow within the story.
OP is also bloated with shallow story lines and characters that are only there to extend the story so it can be milked for more money. There is so much garbage piled over the half decent story that it just makes it so tedious to go through.
HxH has a focused tight story throughout every arc and as a whole, and still manages to have an expansive world full of adventure. I won't say HxH's story is better because Togashi isn't trying to milk it endlessly, because that would be insulting the vast difference in writing talent between Togashi and Oda. Though I'm sure it plays a role.
Why do you guys like One Piece so much? It's the Mcdonalds equivalent of manga.