Ethereum actually has some substantial differences than Bitcoin.
First of all, it is not just a cryptocurrency, but it is a computer system based on cryptocurrency (for example, it allows the so-called Smart Contracts: Smart contract - Wikipedia).
It also does not have a maximum token emission limit (which Bitcoin has), so over the long run Ether's value growth may be lower than that of BTC.
Probably it is not convenient to compare them, while it is better to consider them two different cryptocurrencies that could have different destinies.
And you?
What you think about? Do you think ethereum will be worth bitcoin in the future?