iPhone XS Max
I'm not going to repeat that the best camera is the one that you always have with you, but my iPhone camera IS the one I end up using the most because it is always with me.
The iPhone XS introduces new hardware and software that will allow a larger percentage of users to take photos that will look more like they were taken with higher-end cameras.
I watched the keynote and focused intently on "Smart HDR" and all of the near-instant computations the device is making to generate a "perfectly" exposed image.
For all of my excitement on receiving my iPhone XS Max, after a few days of snapping pics with it, I thought something was very wrong.
Moving forward, in agreement with Sebastiaan, I've decided to turn off "Smart HDR" and will only be shooting in RAW with Halide Camera - this allows me to leverage the new hardware, which is a great improvement, while also retaining overall control over image adjustments.