Like Bitcoin, Ethereum is a scattered public blockchain network.
Although there are many technical differences between Bitcoin and Ethereum, the main difference is its purpose and function. Bitcoin offers a peer-to-peer electronic money system for Bitcoin payments or transfers. Meanwhile, Ethereum focuses its blockchain, to run a decentralized program including one Ether payments or transfers.
Nevertheless the Ripple has a shortage gap. The gap is due to network openness. Nodes in the XRP network structure, allowing Ripple to be vulnerable to attack, which inevitably impacts the user's access paralysis of the transferred funds. I think BTC will stay out as a winner.