Which one of the girls is taller vs. Who is the taller of the two girls

English as a Second Language English Vocabulary, Grammar and Idioms
1

  1. which / who is the taller of the two girls?

  2. How many/ much fruit does your father produce everyday?

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  1. Who is the taller of the two girls. (sounds very formal and like literary English from a novel)
  2. Which girl is taller? (something I would say)
  3. Which one of the girls is taller? (something I would say)
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Both, I’d say, are acceptable.
As there are two definite persons, you may also use WHICH. (Which of the two girls is taller? - Here WHICH ONE is not necessary)
However, Who is the taller of the two girls? is more common.

Your second question, ‘How many/ much fruit does your father produce everyday?’ has two errors.

  1. FRUIT being a non-count noun here, ‘** How much fruit**’ would be better.
    (How many fruits or types of fruits’ is also possible)
  2. The use of everyday is not correct. It should be every day.
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