When Ethereum came out, it was looked down upon because the market hadnt matured yet. No one understood much about cryptos beyond the peer to peer transfer. When the difference between Bitcoin and Ethereum was established, that is when we had a surge of the altcoin rush. This caused prices to skyrocket on all altcoins. It seems as if the roles have been reversed and there is more doubt on Bitcoin than anything else. This is why we recommend you hodl Ethereum over Bitcoin.
Source :
https://usethebitcoin.com/will-ethereum-better-investment-bitcoin-2018/Ethereum is doing better not because of anything but just the proliferation of ICOs.
Under no circumstances is Ethereum better than btc and will beat BTC in price.
It's just a matter of time that ICO's will die and there will be no use for ethereum.