ether has a large user base. many ICOs are built on ether. it is the basis of altcoins. In the long run, it is worth investing. Bitcoin is also a good choice.
Indeed, if we talk about the two coins between bitcoin and ethereum I think we don't need to doubt anymore because both coins are promising and if we invest in bitcoin or ethereum we can get big profits
That is truth! Bitcoin and ethereum including litecoin and dash are some of the coins that you can only makes profits if you invest in them. Remember that bitcoin has given great reward to those that adopted it early and ethereum also performed very will in 2017.