The rivalry between Bitcoin and Etherium Coins is almost the same as yahoo search engine chronology shifted with google search engine, both using the same system called Block Chain. In this Block Chain system, data recording and transactions are performed on multiple servers that are connected to each other. That way, if there is one server that is damaged, the data can still be accessed on other servers.
What distinguishes Ethereum from Bitcoin is Smart Contract implementation, which allows you to program transactions, before you do it. For example, you can create an arisan program that will automatically move the Ether belonging to each participant to the winner's account each month
Just as the more dynamic google search engine is easier and faster to search for it.
Source: https://en.techinasia.com/ethereum-pesaing-bitcoin