Bitcoin is king because it was the first of its kind. Therefore it is the most recognized crypto and trusted as well. However, it does not have the best technology
I think the technology is best as of now, but is it going to be the best for the decades to come is yet to be decided. The reason is that the technology is getting advance day by day and people fed up from the same technology if not upgraded. IPhone, Windows and android are the other examples of this thing. But I guess the good part will be if bitcoin shifts itself to the upgraded versions from time to time with keeping the people on board.