Ethereum and Bitcoin have similarities. Of course there will be differences.
resemblance:

• Both are decentralized.
• Both utilize a distributed ledger technology called blockchain.

The overall goals of the Bitcoin and Ethereum networks are different. Although Bitcoin was created as a substitute for the national currency and therefore aspires to be a medium of exchange and a store of value, the purpose of Ethereum is to serve as a platform to promote unchanging procedural contracts and applications through its national currency.
Ethereum is another use case of the blockchain that supports the Bitcoin network, and in theory should not really compete with Bitcoin.