Bitcoin continues to reign in the cryptocurrency world. Ethereum has built-in tools such as smart-contracts that are attractive, but features like this will likely be incorporated into bitcoin in the future. As more retailers and commerce sites begin to accept bitcoin I can't see where position on top will change any time soon.
Bitcoin has become still stands strong until now. Actually with the ethereum yes it is still been use as the smart contract and its features is good. But in terms of most on top is the bitcoin for me as this is really on growing and best to invest with.