Choosing between Arbitrum and Optimism Choose Arbitrum if: You prioritize the lowest possible gas fees, maximum scalability, and a broad range of dApps. Its multi-round fraud proofs make it more cost-efficient, and the AVM offers greater developer flexibility Choose Optimism if: You prefer simplicity, faster transaction finality (in most cases), and a developer experience that closerly mirrors Ethereum. Its focus on the OP Stack and the Superchain vision is attractive for projects seeking deep integration with the wider OP ecosystem