As related to smart contract and altcoins in general, ETH remains the best and also as a foundation layer for lots of the altcoins found in the crypto market, it will have a strong stand in taking the lead of all altcoins in the market. As the day goes bye, more and new technologies comes into the system, and that being, the competition remains and continues. Looking at the transaction fees of ETH so far, this could have a serious effect to ETH. Bitcoin is the leader of the crypto currencies and that can't be replace or over emphasized, though ETH is having lots of backers, supporters and having the biggest portal in which new projects lay their stands.