Is Yu Yu Hakusho inspired by the Dragon Ball series, or is it just a well-done copy (or the opposite)?
Or is there a closer relationship between these stories beyond mythology?
Is Yu Yu Hakusho inspired by the Dragon Ball series, or is it just a well-done copy (or the opposite)?
Or is there a closer relationship between these stories beyond mythology?
Not exactly an answer, but what both have in common and not mentioned in the comments is that they were released in Shonen Jump. So, not only do they share the shonen demographic, they also share the 'color' of the magazine.
In particular, one factor is the editors. If I remember correctly, a volume of Yu-Yu Hakusho (inside the cover) had a line to the effect "An editor is sometimes a story writer".
The first editor of Dragon Ball is Kazuhiko Torishima and that of Yu-Yu Hakusho is Toshimasa Takahashi. They worked together closely, like starting the magazine V Jump, so it is possible that DB's editor influenced Yu-Yu Hakusho in a broad sense.