I tried scaling up the original into an intentionally convoluted nonsensical problem to see how a more complicated solution would look like for each approach. Do these look right? And which seems the most readable?

  # Functional approach
  
  var favoriteFoodsOfFurryPetsOfFamousAuthorsOfLongChineseBooksAboutHistory = books
    .filter(book => 
       book.pageCount > 100 and 
       book.language == "Chinese" and 
       book.subject == "History" and
       book.author.mentions > 10_000
    )
    .flatMap(book => book.author.pets)
    .filter(pet => pet.is_furry)
    .map(pet => pet.favoriteFood)
    .distinct()

  # Procedural approach
  
  var favoriteFoodsOfFurryPetsOfFamousAuthorsOfLongChineseBooksAboutHistory = set()
  for book in books:
    if len(book.pageCount > 100) and
       book.language == "Chinese" and
       book.subject == "History" and
       book.author.mentions > 10_000:
      for pet in book.author.pets:
        if pet.is_furry:
          favoriteFoodsOfFurryPetsOfFamousAuthorsOfLongChineseBooksAboutHistory.add(pet.favoriteFood)

  # Comprehension approach
  
  var favoriteFoodsOfFurryPetsOfFamousAuthorsOfLongChineseBooksAboutHistory = {
    pet.favoriteFood for pet in
      pets for pets in 
        [book.author.pets for book in 
          books if len(book.pageCount > 100) and
                   book.language == "Chinese" and
                   book.subject == "History" and
                   book.author.mentions > 10_000]
    if pet.is_furry
  }

FWIW, for more complex problems, I think the second one is the most readable.