It is hard to say what coin you should invest with, i think you should decide that for yourself and holding is a very big thing when it comes into trading so you should think and decide carefully, but i highly recommend altcoins like NEO, Ripple, NEM and waves, etc this coins is has a really great background and their purpose is outstanding compared to other coin although even you invest in these kind of coin that does'nt mean you'll profit no one can predict what's gonna happen so there's a really big risk too.