Each cryptocurrency has its own characteristics that make it unique in relation to other coins, so I think that it is incorrect to allocate any one and even more to say that it is the king. Do not forget that in each cryptocurrency at the moment there are flaws that need to be corrected, and what project managers do. This market is only in its infancy and it will take a long time before a unique cryptographic currency appears. And Ethereum is certainly useful and to a greater extent we use It.