I think both are equally good, we see bitcoin at a price now increasingly rising even every second of the movement, so the current bitcoin price is quite large, whereas the etherum with the current price is quite normal, the same as the upward movement, good for inveating inside long-term.
I also have the same view as you. In spite of good investing in Bitcoin now, its price is too high. How's about if you are just a small investor? Let choose Ethereum and hodl it in long-term. Its price will recover in 2018.