Could you please elaborate on the comparison between Ethereum and Litecoin? Is Ethereum truly superior to Litecoin in terms of its functionality, scalability, and overall potential in the cryptocurrency space? Could you provide specific examples or reasons to justify your position? Additionally, how do these two cryptocurrencies differ in terms of their use cases, transaction speeds, and costs? I'm interested in understanding the strengths and weaknesses of both Ethereum and Litecoin to make a more informed decision. Thank you for your insights.