What is the best ETF for Ethereum?

Can you elaborate on what factors should be considered when choosing the best ETF for Ethereum? Is there a specific ETF that has consistently outperformed others in terms of returns and risk management? How do the fees and expenses associated with these ETFs compare? Additionally, what are the potential risks and limitations to consider when investing in an ETF that tracks Ethereum or any other cryptocurrency? Lastly, are there any regulatory concerns or limitations that investors should be aware of when considering investing in cryptocurrency-related ETFs?