The 6P. Because of the upgrades, and because of the fingerprint scanner. With fast charging, these days a huge battery isn't the advantage it once was. Shatterproof screen vs. fingerprint unlock? I think I'll take the fingerprint unlock.
(But I'd really get the 5X because I think the 6P is too big for me...)
Unless battery life is concern #1, I'd go with either Nexus simply due to timely OS updates.
Nexus shipped with Android 6 and supposedly will get two more. With the Turbo, no one knows what it will or won't get.
I wonder what the difference will feel like in the hand size-wise between the two. I've got smallish hands and i imagine both arent going to be as good for one handed use at the Droid Turbo 1.
I'm going to be grabbing the Nexus 6P in a few months. It has a huge battery and I am done with Verizon now that they are raising rates on unlimited data users. I would love to try the Project Fi