This is real problem.Now ETH is 868$ and lTC is 210$.So what will happen end of 2018 ? Mainly we can observe the past of the both ETH is good I think.Now It has based on many projects so its price is pretty high than LTC.So can it be passed ETH ? Definitely No it cannot be happen. Because ETH has based on other (ERC20) crypto currencies too. sSo it will be the best rather than LTC.