I am invested in both BTC and ETH and expect each to do well in 2018. From a percentage gain, I expect ETH to beat BTC.
True, both are very good coins and have a very good potential as well. but the current development of ethereum is very good and I think ethereum will also make some surprises this year
ETH will shows a lot of improvements this year and its a good thing that you hold some of this on your portfolio. But I still go for both of this since I know diversification will always profitable specially with this great two coins. The price of two coins are still down right now, a great opportunity to hold more.