I do think that Ethereum is better in technology when compared to Bitcoin but I really don't know which one would be a better investment.
If the prices were to go up on the basis of technology then Ethereum would have surpassed Bitcoin long ago but this isn't the case.
Despite Ethereum being better technology wise Bitcoin is still up in price and I believe it will continue staying on top for quite a while.
I would place my bets on both the coins and wouldn't want to miss any chances on both of them.