Let's see ... the question is not what superpowers I would want, but what superpowers I would have if I had them?
I'm going to guess Flight, Weather Manipulation, and Illusions. Those tend to be the powers I can get control of on those occasions I manage to lucid dream.
Illusions would be wonderful to work out art with, build references and models up without having to go through a software medium, tell stories, try out music, perfume the air, organize the world around me, arrange to paint fantastic things in a real setting ... enhance any performance. There's so much helpful potential for it, whatever senses wound up involved, and quite useful in sticky situations or to wreak havoc as well, should I need to.