I personally believe that in the future shakedown there will only be a couple of Cryptocurrencies that will survive. Out of these the best bet will be on Bitcoin & Ethereum (Eth). There are a couple of reasons, why Eth sounds a fundamentally good bet to invest for the long term as follows:-

It is not only a pure virtual currency like Bitcoin & Bitcoin Cash (BCC now) but also hold a substantial value in terms of the additional advantage its brings to table in terms of the technology.

It was the first and the only token that has working model in terms of utilizing the blockchain technology