Polkadot’s relay chain model offers shared security across parachains, contrasting with Cosmos’ independent "sovereign chains." While Cosmos enables faster app deployment (e.g., dYdX’s move to Cosmos Hub), Polkadot’s unified security reduces bridge risks, appealing to finance-focused projects (e.g., Centrifuge for real-world assets). DOT’s market cap ($18B) lags Cosmos ($25B) but exceeds Axelar ($8B), reflecting its balance of security and scalability. With 40% of parachains now handling DeFi or NFTs, Polkadot’s cross-chain infrastructure positions it as a Layer 1-2 hybrid, competing with Layer 0 projects like Sui and Aptos on multi-chain utility.