We are in a very speculative moment I'm afraid. No one really knows, which of the cryptos will reign supreme. At the moment bitcoin and Ethereum are it but something may come along to usurp them. An example of this would be Monero and Dash, many spoke of their ascendancy but the jury is still out.
The unsatisfactory conclusion would be that one must pray to pick a crypto, which not only ascends in price but also value. We will just have to wait and see. And by the way, there will be more cryptos on the way. Brace yourself!