I think ethereum will be the most pump cryptocurrencies coming 2019. Ethereum is currently a little above $210 and that means it is currently undervalued because some were this year it went above $1400.
Litecoin will also perform very well next year as it is also currently undervalued and if you can take the risk and buy at $50 you are going to make good profits in future if it get to the level it was last year ending.
Ethereum is a good technology in crypto market but this performance is not well bin this year. So I expect stellar and EOS is best altcoins in 2019 because these two performance is nice to see in this year so all are says it will move to right way. Bitcoin is a forever promising platform so we should not consider in this list.