In my opinion bitcoin is not comparable to other coins, it has its huge value because its the first crypto, everyone know bitcoin, many less know ether and others cryptos. Tecnically bitcoin is outdated, its slow and it has expensive fees. Ether is much better but its not very known and in the future it will have to fight against all the new smartcontract ready blockchain that are following his road
I would say that it's ca common misconception (IMHO) that Bitcoin is the first digital currency. Bitcoin isn't the first digital currency, not even the first crypto. It is the first one that was launched anonymously though. Do you think that if there was another coin that launched anonymously with a really good marketing strategy, but the same core values as bitcoin, it could not gain friction? I think the main difference between all the coins out now and Bitcoin, is that none of them are launched anonymously, save a few.
To answer the question, in general, I don't think you can compare Ethereum with Bitcoin really, the coins are not meant to compete.