Power chords are a staple of the electric rock sound. I like the sound of them with a variety distortion levels. They do sound different on nylon versus steel and certainly different when distorted. I think the nylon sounds too soft for the chord to stand out strongly compared to the full chords you have been learning.
However, I also play power chords clean. There are plenty of songs played on acoustic with just two strings - the blues “chunka-chunka” shuffle is an example in your very near future. 
A hint of your future - think of how the open E would look if you used fingers 2, 3, and 4. This is the shape the first barre you learn will take. The problem with it is usually getting all fingers in place quickly and completely - for me especially finger 1 and not muting with finger 4. But this is a topic for another thread. 