I think everyone agrees world event scoring should be in game and not just the forums. No reason to debate that.
The question is, does the event description tell you which fights are better? This week’s event doesn’t match the scoring, so the description also isn’t reliable.
According to this, I will get light (and thus points), the more divine creatures I kill. Here are the list of fights, their rarities, lights they give, and number of divine creatures they have:
-sacred guardian (ultra rare) (4 lights) (4 divine)
-valor (epic) (6 lights) (1 divine)
-mercy (epic) (6 lights) (4 divine)
-holy st astra (legendary) (12 lights) (1 divine)
-qilin (legendary) (12 lights) (2 divine)
-ishtara (mythic) (18 lights) (1 divine)
So, the number of divine creatures in a fight isn’t relevant. If it were, the two epic fights would give different scoring for example, since even though the rarity is the same, the mercy fight provides much more divine creatures.