Both Bitcoin and Ethereum, have distributed ledgers, but both differ substantially in capability and purpose. Bitcoin offers a peer to peer electronic cash system which enables online Bitcoin payments. Bitcoin functions to track ownership of digital currency while Ethereum focuses on running the programming code of the decentralized application.
Unlike Bitcoin, Ethereum miners work to earn ETH. It is also used by application developers to pay transaction fees and service on the Ethereum network apart from being a tradable cryptocurrency.
Ethereum is better than Bitcoin in terms of network latency. Bitcoin nodes are more clustered than Ethereum nodes, which means that full node distribution for ETH is more decentralized. However, both Bitcoin and Ethereum mining are centralized with top miners as they control more than 50% of the hash rate.