Ark Invest CEO Cathie Wood expressed her preference for Bitcoin over Ethereum during a recent interview on The Master Investor podcast. Wood highlighted Bitcoin's ability to scale as a rule-based global monetary system and its status as a first-layer network that has never been hacked. She contrasted this with Ethereum, which, despite supporting DeFi, faces intense competition from second-layer solutions. However, Wood also mentioned her growing interest in Ethereum and disclosed recent investments in BitMine stock.