After the proof-of-stake consensus algorithm is implemented, Ethereum will be more costly to attack than Bitcoin, says Vitalik Buterin
Source: https://cointelegraph.com/news/pos-will-make-ethereum-more-secure-than-bitcoin-says-vitalik-buterin
PoS Will Make Ethereum More Secure Than Bitcoin, Says Vitalik Buterin
October 12, 2019
CoinTelegraph