For me the two is the best both of them have a good value in the market right now but we can see that bitcoin has the highest value so there are many investors of bitcoin. But we can see also the good potential of etherum maybe in the future like bitcoin it will also have a high value so better for me to invest in both in btc and in eth. It is your way or your plan how to manage your investment the key is in the hand of investor so better make plan for you to have direction to become a successful investor.