Nexus 6P or Huawei P9?

Hello!

So I've decided to finally upgrade from my LG G2, yet I'm very hesitant on which phone to upgrade to.
The ones that interest me the most at the moment are the Nexus 6P and the Huawei P9.
I mainly want to upgrade for better Software, Build Quality, Camera, battery life and Audio (mostly concerned with the headphone jack).

So I'd like to know which seem better and what are the advantages they have over one and the other?

Thank you for responding!

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