I have approximately 10% in Bitcoin and the remainder invested in various Altcoins that I think have a positive outlook.  I think having a diversified portfolio of cryptos that is not too heavily weighted in any one specific currency is a good strategy that may reduce the overall risk in your portfolio over the long term since if one of the investments fails it will not completely destroy your portfolio.  

I am not a financial advisor and the answer above is not meant to be in legal, financial or investment advice.  Please consult your own adviser before making any investment decisions.