For me the king of cryptocurrency is Bitcoin. This statement is heard every year since Ethereum was discovered. It is just a fact that Ethereum is the new king of the crypto market No Never. Bitcoin is the King of cryptocurrency as well as the founder of cryptocurrency and still remains a king.
Bitcoin was the most popular and first cryptocurrency to discover which worked as peer to peer transaction system while Ethereum was used to create applications and smart contracts platform. These two coins are similar to each other In the choice between Bitcoin vs Ethereum, depends on the person how they used and which one they need Bitcoin or Ethereum.