I am ignorant. Is seedsigner not a hardware wallet just like coldcard. Only difference you build it from scratch?
Coldcard is shit. Ledger is shit. The best way to preserve your bitcoin is to first understand that “bitcoin wallets” are pretty unnecessary. While I have them, they serve a different role and are not the best solution for long term storage. Get a seedsigner. nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl
Discussion
Stateless so the device itself is "immune" to physical compromise.
Commodity hardware dramatically reduces the chance of supply chain attack.
Commodity hardware also reduces the chances of being identified as a target for having enough bitcoin to come after.
Seedsigner is not immune to physical compromise. By default it has no tamper evident properties. If you're depending on it as your sole hardware signing device, I would strongly encourage locking it up when not in use and using a tamper evident tape. Odds are low that you'll ever experience an issue, but no reason not to add extra low cost layers of defense.
Seedsigner doesn’t save the seed on the device. Once it loses power the seed is wiped. Coldcard stores the seed in the hardware