Which cryptocurrency will be the winner in the end of 2018? And why you think that?
Is there a competition?
There's no competition and the market cap of each coin tells that they are gaining through market base on their market cap.
But if you insist of looking for a winner, obviously it's bitcoin.
I think, will prove this year Ethereum.
It has to improve also its network, problems are thrown to bitcoin due to its congestion before but ETH also experience it so there should be fairness with everyone's idea.