Ripple CTO David Schwartz issued a fiery response - Ripple CTO Says Bitcoin Is at a Dead End, Refutes Claims That XRP Is Vulnerable to Attack
"No blockchain that I know of has better protection against a hostile majority attack than the XRP Ledger does. Bitcoin will happily allow double spends if the majority of mining power is in hostile hands
PoW has been a dead end for both decentralization and security, Its gotten more centralized, and weve seen 51% double spend attacks. By contrast, distributed agreement has gotten more decentralized, and its clear how to mitigate these attacks in software."
https://dailyhodl.com/2019/03/08/ripple-cto-says-bitcoin-is-at-a-dead-end-refutes-claims-that-xrp-is-vulnerable-to-attack/
"No blockchain that I know of has better protection against a hostile majority attack than the XRP Ledger does. Bitcoin will happily allow double spends if the majority of mining power is in hostile hands
PoW has been a dead end for both decentralization and security, Its gotten more centralized, and weve seen 51% double spend attacks. By contrast, distributed agreement has gotten more decentralized, and its clear how to mitigate these attacks in software."
https://dailyhodl.com/2019/03/08/ripple-cto-says-bitcoin-is-at-a-dead-end-refutes-claims-that-xrp-is-vulnerable-to-attack/