iPhone 6S. Bought it in the U.S. back when British money was worth something so I saved about ?300 despite getting the 64GB model.
The first one I had was one of those that had battery issues, eventually took it into the Apple Store a few months ago and rather than replacing the battery and returning my scratched phone, they just gave me an entire new unit which was cool. I doubt it was a coincidence that Tim Cook was in there meeting all the employees and giving me a new phone was faster for them :P
I really like it - "Force Touch" or "3D Touch" or whatever its called is occasionally useful, it almost never crashes, the camera is great and it even recovered from being dropped in a toilet (Rice actually works at sucking moisture out the main camera) then left in its case with water trapped in there for over 12 hours whilst I was hungover, which is impressive.
I was intrigued by the Pixel as it seems to obviously counteract the main issues of Android whilst also being a pretty good phone but otherwise I'm sticking with this until they stop updating its software, and perhaps after that given how they removed the headphone jack. I love how it works with my Macbook Air, but given the user-hostile changes to their refreshes of Macbooks and iPhones I'm at a bit of an awkward situation in terms of needing to upgrade in the near future with no good options. I just don't trust Google as much with all my data as I do Apple, whether that's right or not I don't know.