Now that you choose BTC or ETH or BCH are good, they are two very good coins if you hold them for a long time, now the market is showing signs of recovery and the sale of coins will make you regret later.
For me its better to invest to all because all of them can gives yiu good profit. Investing in Bitcoin is really good because it is one of the most secured investment, while Altcoin choose the Ethereum to invest because it also can give enough profit, then invest in ICO but choose wisely because there are some ICO not worth it. All of them have risk so its depend to you if you take the risk if you want to get profit.