Well if you want to be sure, then diversify your investment. All of that coins are still a good and promising one. Etherium have shown sudden change in value and we could still expect for its increase in tge coming months. Etherium is actually now gaining demand from the market. There is a great expectations for it to really increase in value. Bitcoin is still the king of all coin. It actually has a possibility to hit harder in tge next few months. People are niw coming to know it and starting to accept its use.

Another choice would be investing in an ICO, there is actually greater profit ob that. The possibility doubling the value of your investment is so easy, its just that its more risky than investing in etherium and bitcoin.