Both Bitcoin and Ethereum and good investment options. Bitcoin mainly because it is the first coin out there and has great popularity amongs most people. It's most likely to profit the most when the word about crypto goes to the mainsream. Even though many people know about BTC there are nearly not enough yet to who are owning it. That will probably change in the future and I expect the value to quadruple within a couple of years. Ethereum from the other hand is a good investment as well because it is the basis for decentralized applications, which are basically applications, but decentralized (there are many benefits to that which I won't go in more detail here), the point is that it's something that will be used a lot in the future as well, and once people get involved with BTC they are likely to get involved in other crypto's as well, and ETH will be one of them.