Appchain for DeFi
Verdict: Superior for specialized, high-value capital pools.
Strengths: An appchain's TVL is its own sovereign metric, representing deep, dedicated liquidity for its specific protocol (e.g., dYdX v4, Aevo). This concentration enables maximal capital efficiency for the native DEX or lending market. You control the economic policy and can design tokenomics (like staking rewards) to directly bootstrap and retain TVL.
Trade-offs: Liquidity is siloed and not natively composable with other chains. Bootstrapping initial TVL requires significant effort and incentives.
Arbitrum One for DeFi
Verdict: The dominant choice for broad, composable liquidity.
Strengths: With over $18B TVL (DeFiLlama), Arbitrum One aggregates liquidity across hundreds of protocols like GMX, Aave, and Uniswap. This creates a powerful network effect: deep pools on Curve and Balancer, robust lending markets, and seamless composability. Developers plug into an existing, massive capital base.
Trade-offs: You compete for attention and liquidity within a crowded ecosystem. Protocol fees are shared with the sequencer and validators.