A few options Identified so far, though nothing stands out strongly:

1. /e/, possibly one of the pre-loaded Samsungs available on the site [0]. Explicitly positioned as privacy-respecting: based on Android though, albeit without Google Services. Don't know how reliable it is?

2. Fairphone 3 [1]. Focused on sustainability rather than privacy. Runs stock Android so not viable on the privacy front. Previous versions supported alternative ROMs, though not possible yet on the 3.

3. Purism Librem 5. Strongest commitment to both privacy and sustainability, but not ready to be a daily driver yet (maybe ~1 year away).

I've excluded an iphone above. Apple's privacy claims are laudable but feel very much strategy credit rather than deeply-held principle.

Any experiences with above / other suggestions? Thanks.

[0] https://e.foundation/ [1] https://shop.fairphone.com/en/ [2] https://puri.sm/products/librem-5/