What zombie work, across all mediums, does it best?

Some punctuation and the proper superlative makes OP’s title a bit more readable.

I think he means which zombie representation was the best among all media

My best guess is that they are asking that out of all of the zombie lore that’s out there – live action tv, cartoons, movies, comic books, etc – which does the community think is the best of the best.

I think they want to learn about people’s favorite zombie stuff, and open it up to movies, books, games, songs, sculptures etc.

Something like:

What work in any medium, that is about/ includes zombies, is the best and why?