Data on developer migration from Bitcoin L2 to Ethereum L2 ecosystems is scarce and mostly anecdotal. No comprehensive, verified datasets specifically track this trend. However, Ethereum's L2 solutions, like Arbitrum and Optimism, boast higher Total Value Locked (TVL) and developer activity, with Ethereum L2s processing 11-12 times more transactions than Ethereum L1. Bitcoin L2s, such as Stacks and Rootstock, face challenges like limited smart contract functionality and slower transaction speeds, potentially driving developers to Ethereum's more mature DeFi ecosystem. For instance, Arbitrum hosts 331 dApps, while Bitcoin L2s struggle with liquidity and adoption. Despite this, no direct evidence quantifies developer migration. Ethereum's robust tools and EVM compatibility likely attract more developers than Bitcoin's nascent L2 landscape.