It's obvious and easy to see differences and compare all products on their website, but they only looking similar from the outside.
In short, Satochip is a hardware wallet for making transactions, and Satodime is more like physical bitcoin aka the bearer cold storage.
https://satochip.io/compare/Yes, I saw this comparison. The difference is only in the use value.
The hardware differences interest me. As far as I can see, both solutions use the same EAL6-certified secure element, so it seems it's just a matter of software.
In terms of hardware, there is no difference. Each product uses the same J3Rxxx smart card equipped with an EAL6+ certified chip (SE).
Satochip is a signing device, which means that it can sign a transaction using the unique private key stored inside its SE.
Satodime is not a signing device. It can generate a Bitcoin key pair (up to 3) inside its SE and will only reveal the private key if requested by the bearer. If you want te retreive the Bitcoin from a Satodime, you'll have to unseal the keyslot and sweep the private key in your existing wallet.
Same hardware - different products - different use cases.