Most people are increasingly investing using this strategy which you just mentioned. It's not wise to just invest in one coin when you could invest in more to secure the chances of earning from all of them and even have something like a safe path to your investments.Right now I won't say there is a right coin to invest in. Anyone can do just fine. But if you don't want to limit tour you can invest in about 3, so that when one depreciates the other can fill it.