Ethereum becomes a king on the tech comparable but not for the adoption, i think that the bitcoin already become the king on the adoption and the last will be litecoin itself because you can see the latest chart on coinmarketcap..
That's right. No matter what, bitcoin is still on top of the game. Many people understand how to use the bitcoin, but ethereum, a lot of people are still new in using eth for their transactions. Even legendary here, I saw that he had a noob question regarding ethereum.
Also, exchanges, local or worldwide, their main cryptocurrency they are using is bitcoin when converting to their local fiat currency. Just like here in my country, the top 3 exchanges use only bitcoin as the only digital currency for buy and sell orders. You can see that also for yourself in online commerce industry. They treat bitcoin as one of the fiat currencies already.