Both coins will have a great future. Ethereum is a high potential altcoin. And it is next to bitcoin because it is in the top also
All the coins which has a good team will have a chance to beat BTC in the top.
ETH is next to bitcoin but it's one of the worst performing coin this year, it's down below $200 now and that hurts a lot of investors
but not me because I've seen this many times and I am expecting a rebound.