Yes you are right that Ethereum is the best crypto next to Bitcoin, Bitcoin is much more expensive and Ethereum is no less expensive so we can see that Ethereum is right next to Bitcoin. Ethereum is used just as much as Bitcoin. Because in order to send any token, Ethereum is needed first, because no token will be sent without Ethereum. So it can be said that Ethereum is just as important as Bitcoin. So the popularity of etherium is much higher. In this way, Ethereum became next to Bitcoin.