Whenever looking to invest, whether it be in crypto or stocks, it's always wise to diversify your portfolio. With that said, any investment should be proceeded with lots of research. Without research, it is no different than gambling at a Casino. My two cents about Ethereum's investment over Bitcoin is the technology behind it. With a whole network of dependent tokens (ERC20), its hard not to pick it. Definitely looking forward to what 2018 has to bring!