Which L2 is best for DeFi?

Could you elaborate on which Layer 2 (L2) scaling solution would be the most suitable for decentralized finance (DeFi) applications? With the rapid growth of DeFi, scalability has become a crucial factor, and various L2 solutions are emerging to address this issue. Each solution has its unique features and advantages, so it's essential to consider factors such as compatibility with existing DeFi protocols, transaction speed, cost-efficiency, security, and decentralization level. What are the key considerations when evaluating an L2 solution for DeFi, and which one currently stands out as the most promising option?