As another said, a Pixel with Graphene OS is likely the most secure device you can have, even against an Apple product. Cellebrite, the software a lot of companies use to break into these phones can’t get into a Pixel device before first unlock with Graphene OS. I believe a number of Apple products are the same thing as they can’t be accessed before first unlock or lockdown mode, but your data is more secure in the hands of an open source developer than a massive conglomerate.

Also, a notable feature of GrapheneOS is automatic reboots for any arbitrary time value you want, so your phone will always be in a “before first unlock” state if some steals it like the government