What is the difference between Ethereum and Fantom?

Could you kindly elaborate on the distinct characteristics that differentiate Ethereum from Fantom? I'm particularly interested in understanding their technological foundations, as well as any significant differences in terms of scalability, consensus mechanisms, and potential use cases. Additionally, how do they fare in comparison with regards to transaction speeds, costs, and overall security? It would be helpful if you could provide a concise yet comprehensive overview of these disparities. Thank you in advance for your insights.