It seems to me that Ethereum is much more promising and should bypass Bitcoin in the long run, but probably in the price, it will not be able to get ahead of it. The thing is that Bitcoin is very limited in the number of coins, but there is no Ethereum. If ETH is limited, it will be very cool and it will be a strong shot!
Ethereum is a coin that is getting its fame now, Bitcoin is going to remain at the #1 rank till something says otherwise.
I think the appropriate question today is the comparison between the BTC and XRP, some days have had the Xrp volume times higher than the BTC. ETH has been in second place