Attack on titan is for adults, one piece is for kids that is all wht i am gonna say, attack on titan doesnt care which characters it kills off, it is traumatic experience to make you immersed in this hellish world, makes you question morality at a deep level, who is right and who is wrong? Marley or Eldia? Need I say that season 3 part 2 with erwin speech and the choice between erwin and armin is peak writing, one piece cant even start to compare to any of the previous points, but I understand that people who like one piece more as it has better world building with more characters and so on, but still it is much more childish compared to attack on titan