The cryptocurrency that I will invest in 2018 is the ethereum altcoins because I see in ethereum coin , the good benefits of ethereum and functions and use of ethereum in different sites and in the market of exchange, It is also a promising altcoin as I believe in it.
For me Ripple and Monero are the best coins for investment in this year. Market value is increasing day by day and the price is also growing. I think you can make handsome money from investment in these two currencies. No doubt good projects also giving good results, but if you have trading experience then bitcoin should the first priority for trading.