This is actually a lot harder than I thought it would be as for the most part I want to say 'it depends on the situation'. Also, it does depend on whether I'm looking at it from a writer's or reader's point of view. Plus, there are a couple where 'neither' would be the answer as I don't read in that kind of universe, so I've sort of gone for what I would prefer were I to read it.
Nonetheless, I have done my best to choose what I prefer in the majority of stories.
Slow burn OR love at first sight: Love at first sight.
Fake dating OR secret dating: Secret dating.
Enemies to lovers OR best friends to lovers: Best friends to lovers.
Oh no there's only one bed OR long distance with correspondence: Long distance with correspondence.
Fantasy AU OR modern AU: Modern AU.
Smut OR fluff: Fluff.
Mutual pining OR domestic bliss: Domestic bliss.
Alternate universe OR future fic: Alternate Universe.
One shot OR multi-chapter: One shot.
Kid fic OR road trip fic: Road trip fic.
Reincarnation OR character death: Character death.
Arranged marriage OR accidental marriage: Arranged marriage.
Time travel OR isolated together: Isolated together.
Neighbours OR room-mates: Neighbours.
Sci-fi AU OR magic AU: Magic AU.
Bodyswap OR genderbend: Neither.
Angst OR crack: Angst.
Apocalyptic OR mundane: Mundane.