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 Tecnically bitcoin is outdated, its slow and it has expensive fees.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
As i heard from legend in this forum, bitcoin is not the first crypto, there are other crypto but has no value like bitcoin now and they are not popular in community.
However, etherium will not ever change bitcoin because etherium has more supply.