That's the thing that bitcoin has superiority over others because it is the most popular cryptocurrency and it has the first mover advantage that's why many people are adopting it compared to others that has lesser adoption and superior in terms of scalability and transaction time. A lot of times that bitcoin has been compared side by side to other coins in its specification and there are even others that is faster and no transaction fee but since bitcoin is superior in terms of adoption then it is better cryptocurrency over others at the moment.
There are what they call the new generation altcoins that has new features and more innovative than the previous coins and much more better than bitcoin but then these coins are not that famous yet and not use in its actual use case that's why it has less attention so less demand but as time goes by, these coins could get the attention that they deserve as the technological world would move on to blockchain technology from the standard technology we are using nowadays which is centralized.