Is there any differences between phones made by Chinese manufacturers vs others if no custom ROM is installed?

I want to buy a mobile phone for my mum. It’s basically a burner phone since all she wants are phone call, YouTube, WhatsApp and a few other simple apps. And because she’s not a tech savvy, I don’t want to install custom ROM which may require extra maintenance. Pixel is not an option because of the reasons above and the fact that it’s not sold in my area. (She demands that the phone needs to be sold locally so …

chinese phones privacy vs