I like the timely updates and I very much like the UI. Not just the Material You color scheme (which I initially thought was a useless gimmick but have come to really like) but the look in general. Everything is just so pleasantly designed. I know that people around here hate too much padding but I think that’s what makes the Pixel UI look so good. On other phones I always have the feeling that the padding isn’t right; for example, on many phones (especially Samsung) the text in the status bar isn’t center-aligned vertically and it drives me nuts. Or the text is squeezed into the corners.
On top of that there are useful features like Call Screening or Live Transcribe. And the voice typing is phenomenal.