I am using Nexus 6P from last 7 months and I am very happy with this mobile.
Every smartphone must have few features to be the best. They are
Good Battery backup
Good Camera
Great performance
Software update
Great display
It has 3460mah battery which will stay a day in normal usage.
It comes with 12.3MP rear and 8MP front facing camera which is the best Nexus camera ever.
About performance, its the beast.
It gets the 1st and fast software update.
It comes with 5.7 inch WQHD AMOLED display which is the best in the world.
Camera is one of the bst feature and it has the best Nexus camera ever. It has also support fingerprint feature which is the best till date.
There are many pro’s buying Nexus 6p. Mainly the software update. It comes with stock Android which is the pure Android as Google developed. This mobile has greater RAM optimization which makes multi tasking fluid. Just go for it without any doubt. It is one of the best phone you get for great price.
Got gamers also it is the best. It comes with 3GB RAM which provides great user experience.