The project can be influenced by many things and you have to divide money into a number of different coins. Buy ETH with half of your money and invest the rest in icos.
I am now on the contrary, I translate everything into Ethereum. I sell those altos that start growing up of candle, making quite good X's. Apparently, after the growth of the altos, there will be their correction with the subsequent growth of the Ethereum itself.
In any case, many users of cryptocurrency today trust Ethereum, but still it is better to minimize the risks and distribute their investments 50 to 50. 50% can still be given for the ethereum, and the rest for not less than rated coins.