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 the ones who are there in the world of the crypto currencies since long, this choice of the coin is hardly a big deal as they exactly know the coins which can then help the in making more money. However, it is better to invest in coins like that of bitcoin, ETH, ripple, litecoin and similar other coins as this will then help you in making more money and above all, their market value is also quite low for now.