I spent the last two months testing both the OneKey Pro and Ledger Stax side-by-side. One costs $278 (with the 10% discount), the other retails for $400. The spec sheets look similar, but the security architecture and design philosophy are completely different. Here's what actually matters.
Security Chips: EAL6+ vs EAL5+
The OneKey Pro uses four EAL6+ secure elements. Ledger Stax uses one EAL5+ chip. That's not just a number difference—EAL6+ requires formal verification of the security design and is the same certification level used in government smart cards and military hardware.
OneKey's quad-chip architecture means even if one chip is compromised, your private keys are still protected by the other three. Ledger's single-chip design is a single point of failure. I'm not saying Ledger's chip is weak, but when you're storing six-figure portfolios, the engineering margin matters.
Both devices claim to be air-gapped, but OneKey Pro actually supports offline QR code signing for transactions. You can keep the device completely offline and still sign transactions by scanning QR codes with your phone. Ledger Stax requires Bluetooth or USB connection for every transaction.
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