Ethereum Layer 2 solutions like Optimism and Arbitrum remain top investment choices in 2025 due to scalability and cost efficiency. Optimism leads with Superchain integration, attracting developers with shared security. Arbitrum dominates in TVL and DeFi activity, benefiting from Stylus (EVM+WASM compatibility). Both face competition from zkRollups, but their first-mover advantage and ecosystem maturity make them safer bets. Investors should monitor adoption rates and fee structures to assess long-term viability.