Spread your funds across these three all. There are all good for capital growth. Bitcoins will keep on increasing despite the short term downward trend. Altcoins are directly proportional to bitcoins price , that is why any direction of bitcoin affect altcoins. To put your money in only these two will mean you taking a double risk. Hence the need to invest in ICO too which can triple your capital in just a year , if only you  make a good judgement and choose the correct one. .