$ETH uses the account model where addresses are reused. This is far more vulnerable to quantum computing than UTXO based models $AVAX uses UTXO on x-chain but @coreapp is reusing addresses so they need to work to fix that $SOL is the most vulnerable, their addresses are straight up public keys so you have a direct mapping from public key to account balance. Hackers can direct quantum brute force attacks against specific rich addresses