Why did you limit the options to black and white? Which means of security of bitcoin are hardware wallets and paper wallets, there are many options with high security and the most reliable.

Paper wallets are used for gifts and for storage when you want to move to a country or other item, but they are not suitable as a way to store all of your savings.
You can buy a phone at a much cheaper price than device wallets and convert it to a solid device.
You can also use an old computer and turn it into secure hardware.
You can try USB and open source OS.