I am considering getting an Android phone as my main work phone. Cost is not that big a concern (within reason). What do you think is, at present, the best Android phone?

Possibly a phablet since I really like the big screen (currently my main phone is a Lumia 1520, and I love that size), and no less than 64GB internal storage.

I am considering:

Nexus 6P
One+ 3
Asus Zenfone 2

But, for no particular reason.

What is your take, guys?