I think you are right that ethereum the most popular and it is rank #2 in all crypto coin and it is already proven that holding this type of coin is profitable,if we are going to compare eth to btc there is a possibility that we will earn big profit in holding eth but compared to btc i will still choose btc for long term holdings or invest on both coin to gain double profit.
For the price of ATH, of course, it is not the same as BTC and if we invest ETH long-term although long it will also reach 20% of the current BTC price. My outlook for ETH is a good investment. I'm also following the development of their ETFs as well at the moment.