I’m just gonna give out my opinion to resolve some loose ends here. HxH is better than jjk because of the awesome worldbuilding, strong characterization and development, the greatest power system, deep themes (themes of courage, revenge, friendship, humanity, consequence, moral grayness, etc), the deconstruction of shonen tropes and all that other shonen stuff, etc. Also Hayao Miyazaki (the genius behind studio ghibli) once said that “If you just have non-stop action with no breathing space at all, it's just busyness, But if you take a moment, then the tension building in the film can grow into a wider dimension. If you just have constant tension at 80 degrees all the time you just get numb.” That describes the biggest problem with jjk, there is only fighting and no room for worldbuilding, story, character development, etc. Also 75 percent of jjk’s fights have no emotion. In my opinion a lot of the characters are very uninteresting. The author focuses too much on hype moments and shock factor rather than writing a compelling story with an emotional heart and all that other good stuff. And that’s why I think hxh is a masterpiece and comparing it to jjk is disrespectful to hxh’s greatness in my opinion.