After reading a bit, I thought about the Cons of every anime.
Naruto:
You could be killed at any given time, and the murder will be done swiftly and the killer won't ever be found.
DBZ:
Other forces outside the earth could easily destroy your planet if they really wanted to, making survival a lot harder.
Sword Art Online:
Though it seems cool, but have you thought of the consequences of living there can be? Either you become someone working inside the town, that way you won't die, but if you decide to be a warrior, once you die, you're dead forevah.
One Piece:
It's at the age of the Great Pirate Era, there are thousands of pirates sailing the seas. Either you become a marine, pirate or a normal villager, either way you're risking death, Pirates always gets attacked by other ships (marine) and even other pirates, while being a villager, your village might be targeted by pirates and boom, you're dead right there.
One Punch Man:
Unless you plan to become Saitama, only one Saitama in the whole frickin world. If you're a normal hero, or just a normal citizen, you're bound to die some time. Have you seen how many World Crisis that happens in there, like woo, they could really destroy the whole world. And as a hero you'd want to go kill villains and stuff right? You could die just like that. This is the worst of them all to tell the truth.
Attack On Titan:
Unless you're half titan or very hardcore, you wouldn't want to be in this world. You'll always live in fear, knowing thhat you'll die, but when you keep asking yourself, you know that someone dear to you will die, and when the day comes you see your children stomped on, your wife being eaten, your brother getting toyed with. This is on 2nd place.
I'd choose Pokemon though, it's so much fun there.
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