As for me, I choose to hold both Bitcoin and Etherium, it helps me to reduce the risks of my investments and maximize returns. I do so because diversifying the investment portfolio is very important aspect in investment based earnings
I am also holding both Bitcoin and Ether, though not as a way to reduce the risks to my investment, because data from the market shows both cannot effective hedge each other and it is only to an extent that it can be said to be diversification. The main reason holding both of them makes sense is because until now, the entire cryptocurrency world revolves around the two.