The reason for that level of sucess is because it does better what it proposes to do, which is to be a good store of value and censorship resistant. Most other currencies try to do the same, but there is no way for them to achieve this being so centralized.
I think Bitcoin Bitcoin is very special to other cryptocurrency because it allow us to choose, we have our own right to work on ge day we think we are productive and rest for the days we are not, Bitcoin doesnt limit us for the capabiloties we can do, you can create so much account aside from one, so you can be able to productive at the same time without any disturbances.