Why is Ethereum better than Avalanche?

Could you please explain to me why Ethereum is considered superior to Avalanche in the cryptocurrency and finance world? Could you enumerate some key factors that make Ethereum stand out? I'm particularly interested in understanding the technological differences, as well as the practical applications and the overall ecosystem surrounding these two projects. Additionally, could you also discuss the potential risks and limitations associated with Avalanche, compared to Ethereum? I'm keen to get a comprehensive comparison to help me make an informed decision.