Soldato
iFixit gave the 5X 7/10 for repairability. Hoping the 6P is just as good. Replacing the battery if needed is going to be neat. Plus who doesn't like taking things apart?
I intend to keep the 6P for longer than any other phone I've owned, so this will be one big factor how long that is.
Didn't you say that about the Z3?
I typically keep mine around 6 months, but usually Nexus devices last me a little longer.