That's hard for me to say. Really depends on your experience and what you like/dislike about the 6P and Android in general.
I came from the Nexus 6 so it was a worthwhile upgrade, but the 6P might not be as big of an upgrade on specs alone. Though from my own experience and seeing what other people are experiencing, the Pixel is one of the best Android experiences. Might think of it as the iPhone level experience for Android, where things just work and are smooth and snappy.
Battery life has been great, probably better than the 6P but only time will tell if it continues to stay good.
Overall I really like the phone and am happy with it.