Comparison of performance on sorting vs. scoring on date field

Since results are ordered by relevance by default when performing a search in ES, I have at least two options to obtain a sorted result set if I want to sort by a date field in descending order:

  1. I can do an explicit sort with descending order
  2. I can use a custom scoring function using a decay function on the date field with "now" as the origin

Does one of these options consistently perform better than the other? If so, why?

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