Ethereum's limitations have led to the rise of 'Ethereum killers' like Cardano and Solana.Solana, launched in 2020, uses Proof-of-History (PoH) to synchronize time for faster and efficient transactions.Cardano, launched in 2017, focuses on overcoming earlier blockchain limitations and uses proof-of-stake for security.Key themes in Cardano's development include foundation, decentralization, smart contracts, scalability, and governance.Solana and Cardano both support dApps, smart contracts, and NFTs.Solana has a higher market capitalization and faster transaction speeds compared to Cardano.Solana offers low fees and fast transactions, while Cardano emphasizes academic research and decentralization.Solana faces network outages and challenges in decentralization, while Cardano experiences slow development and emerging competition.Solana currently outperforms Cardano in terms of transaction speeds and fees, making it a more preferred option.While both have potential, Solana's current performance and adoption make it the leading choice over Cardano.