When investing, Im a big fan of diversification of portfolios. I believe that both Ethereum and Bitcoin offer value, albeit in different ways.
Even though Ethereum is positioning itself to become a large platform, the fact that Bitcoin is so well known makes it the first place where people invest.
You are right. Diversify your portfolio. There is no need to get confused as to whether Etherium is better than Bitcoin or the other way around. Definitely, it is wisest to just invest on both. Bitcoin is the top among all so there is no question about BTC investment. ETH for me comes in second so the argument is the same. No need to make a fuss as to which to choose.