Among all of them I will choose the best three, I think Etherum, ripple and bitcoin cash can be a part of Altcoin that has a good prospect level. But I will choose Etherum as the best, If seen in prospect and also analysis then Etherum always give price stability every time. From 2017 the price of Etherum is always stable and now the price is likely to increase. This is a thing we must choose appropriately, Altcoin's investment selection will be the determinant whether we will gain or even lose.