dikaios1517 on Nostr: These devices aren't really comparable. They are completely different ...

These devices aren't really comparable. They are completely different use-cases/threat models.

SeedSigner is just a signing device. Your keys are not stored on it at all. You must load your seed from however you have it backed up each time you want to use the device. It is made from general purpose, off-the-shelf hardware, making it very unlikely that the hardware itself is going to be trying to leak your private key to the manufacturer. Whether the firmware installed on that device is malicious will depend on whether you built it yourself or bought it already built, and whether you verified the firmware before installing, etc.

ColdCard stores your keys on the device, and has many security measures to attempt to ensure that the keys cannot be stolen from the device. You are also highly encouraged to keep a seed backup. The hardware is specialized and you are trusting the manufacturer is not malicious. That said, the code is reviewable, so you can verify what is running on the device, if you have the know-how.