Post sales servicing as a differentiator
Here's another key differentiator I've come across in favour of OnePlus.. I dropped my new 3T phone, which completely destroyed the screen and was shopping around for repair options. I found I could send it to a local repair outfit who said it would cost be ~170£ for a 2 day turnaround. I then found that OnePlus offers repair options for about ~80£ with about 10 days to turnaround, but the warranty remains intact. I clearly went for the OnePlus option. The whole process was totally seamless, organised through your OnePlus online account, UPS comes home to pick up, and you track progress and delivery through your account again. IMO post sales servicing is another factor that should get covered in all device reviews.