how can we have to say that. every day in the market new coins are coming and it has great demand so we can't say particularly only few coins list. in 2018 we have to see market demands and invest in to that. finally you get good output from that. most of the people investing in new coins but it is not correct first you have to absorve which coins has great demand and invest in to that coins. like bit coin, ethereum, lite coin, neo coin, waves, dash coin, ripple coin and nem it all are had great demand and next in 2018 some more coins are introducing so you have to wait and invest in that. if you get any doubts once search in the coinmarketcap.com