If we're talking about extreme privacy, I have to agree with some of the comments here, get an old but decent android with a removable battery, if you're savvy enough get a custom rom and get rid of everything you don't need, it's not an easy task btw.

If we're just talking about daily usage, no bloatware and a smartphone that will last you for a couple years, get a Pixel, even a used one will do, just make sure to get GrapheneOS on it, you'll be :)