None of these are bad as long as the animeverse is a cover name for hentaiverse. Backrooms is good for level 1 and 11, and it would feel interesting to have to survive that temporarily. Frontrooms is just... frontrooms. Hentaiverse is- something im not gonna explain... YourVerse would be nice for a while but then get boring. The movie/game/show one really depends. A fantasy one would be nice.
Building my own universe is the best option here. The real world is currently crumbling because of WW3. Building my own world would mean I am at peace, somewhere safe, relaxing, and away from all life problems. It would just be paradise.