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 Tecnically bitcoin is outdated, its slow and it has expensive fees.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
Yes, bitcoins is not really comparable to other coins because of its value that is ahead to altcoins but altcoins are created to compete with bitcoins and there are a lot of coins who can really surpass bitcoins if people will choose another coin rather than investing more on bitcoins so it is still possibe for altcoin to become the next number one coin in the market.