Who is Ethereum's biggest rival?

Who exactly stands as Ethereum's biggest rival in the cryptocurrency sphere? This question lingers in the minds of many investors and enthusiasts alike. Ethereum, being a leading platform for smart contracts and decentralized applications, has gained immense popularity over the years. But with the rapidly evolving world of crypto, competition is fierce. Some argue that Solana, with its scalability and high transaction speeds, poses a serious threat. Others point to Cardano, emphasizing its focus on security and scalability. However, the true answer may lie in the eyes of the beholder, as each platform offers unique features and capabilities that cater to different needs. So, who do you think is Ethereum's biggest rival? And why?