When you say important coin, from what perspective are you driving from and to what conclusion? Every coins are important in their own forms, that is why their ideas where supported for it to stand. Monero is supported by you and it has its own importance from your perspective. ETH is number one out of all altcoins, cause it has its own form of technology called the smart contract and is a foundation layer for all altcoins under the smart contract, which majority of the coins in the market are. BNB is another fast growing coin that has a bright future on the long run, doge coin, dego etc. Every coins are important and their role to play in the crypto space.