Hardware is hardware. Whether it is US, China, etc the most vital component ends up being the OS at the end. It is the OS that you are entrusting the programs and apps being run and the accounts being logged into.
If you want security and privacy, grapheneOS appears to be the best option for OS. Something can be secure but not private, and private but not secure. Example being running /e/os or lineageOS on supported hardware might be more private but might not be as secure as stock Google on a Pixel or iOS with lot of times inability to relock the bootloader.
Phones do not have the luxury of PCs with large range of supported hardware with lot of freedom to install different operating systems without issue. There isn't a luxury of the perfect private and secure phone to purchase.
You look among what is available to find what lets you install a non corporate run OS that is as secure as possible.
Hopefully Linux supported. That's the main selling point of AMD GPUs right now for me, since there's less problems with trying to get stuff like HDR running on it than NVIDIA.
I wonder why China is still for the most part ignoring Linux in favor of Windows. Like to update 8bitdo controllers they only provide a Microsoft program and no Linux version.
You'd think they'd be rushing towards pushing Linux adoption.