In fact, both these coins are suitable as an investment, so you can choose any of them. It is not so important that you invest in Ethereum or Bitcoin, because these two coins have the potential and will grow. Without the growth of Bitcoin there will be no growth of Ethereum, so do not think that you will buy Ethereum and it will start growing on its own. The only nuance is that as a percentage, Ethereum is able to grow faster than Bitcoin. The main thing is that you keep your money not in FIAT currencies, but in the crypt.