the main competitor of the Ethereum is NEO. it is also called the "Chinese Ethereum". their goals are the same - an open source site for creating decentralized applications and smart contracts. but the difference is still there, which makes each one popular: support for the Ethereum is the developer base, while NEO has the full support of the Chinese government, which made it popular not only domestically, but also abroad. nevertheless, I believe that the Ethereum is more reliable and more predictable compared to NEO. in the market it is longer, which means that it also has the support of large investors who trust it.