I can only give warnings, not recommendations, in this area, because phones suck these days.
My warning for DivestOS is what I was saying about single-party accountability - if you have any sensitive data on your phone, and that data gets in the wrong hands, your response is disadvantaged by not knowing if the leak came from the maker of your phone or the maker of the OS.
That said, you can still use DivestOS to adopt alternatives for Google software and strongly signal to Google that you're so done with their shit, you are ONLY using a pixel because it has the third-party support.