The market share gap between Bitcoin and Ethereum is likely to widen in 2025. Bitcoin's dominance has surged to 62.2% in Q1 2025, the highest since February 2021, while Ethereum's share dropped to 7.9%, its lowest since 2019. Institutional preference for Bitcoin, driven by its liquidity and regulated status, along with strong ETF inflows ($1 billion in Q1) and public company holdings (689,059 BTC), reinforces this trend. Ethereum faces challenges from a 45.3% price drop, net ETF outflows ($228 million), and competition from faster blockchains like Solana. Despite Ethereum's DeFi and staking potential, its ETH/BTC ratio hit a five-year low of 0.022. Without significant catalysts like the Pectra upgrade or renewed retail interest, Bitcoin's lead should persist.