This question already has an answer here:

Should you go all the way down when doing pull-ups or chin-ups? Or should you stop when your arms are at 90 degrees?

marked as duplicate by Dave Liepmann, Alec, rrirower, JohnP Feb 19 '17 at 23:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    @gwaigh: That question is about injuries to the shoulder. I want to know about effect on the muscles. – Pierre B Feb 17 '17 at 18:35
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    What is your concern about the range of motion? What outcome are you trying to achieve? – Christian Conti-Vock Feb 17 '17 at 18:42
  • @PierreB - I tend to agree that it is a duplicate. While there is mention of pain, the main question is "Is there any benefit to locking out shoulders", and that is the main focus of all the answers. – JohnP Feb 17 '17 at 19:35

Well, the harder = the better. Going up and then all the way down is a harder variation and it has a better effect on muscle growth.

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