Ethereum occupied the second place in the crypto currency ranking.Then why you have a doubt in that.If it's possible to replace a bitcoin in future,it will be made by Ethereum.As like bitcoin,the price of Ethereum will reach 5000$ soon.So you can choose the ethereum for your investments.
probably ethereum from now on will be good if see for its value now a days its raising up like bitcoin roll over for almost more than 5 years in service. and ethereum with be in that flow right now, how much more when it will roll many years to come so I'd prefer to say that ethereum is good also to invest as it is the 2nd in ranking on crypto market.