Assuming there were other people in the world with super powers. I'd take the ability to control other people's super powers. Otherwise just the ability to stop/slow time
ability to manipulate people into doing what I want and make them forget when I don't need them anymore
The total control of all forms of energy, and hence the capability to absorb and dispense it at will. The universe is just a massive abundance of energy. I would control heat, movement, and pretty much could bend the world to my will. It would also make me immune to bullets, explosions, heat, cold and generally almost any type of injury, since everything including diseases operate via energy. Not to mention bullets fired at me would only give me more energy which I could use against the shooter. And since I'd control energy, I could already travel at ridiculous speeds (so screw flight), and could theoretically even create matter if I got enough of said energy focused into a small space. Basically, it's like being God
Not necessarily, I'd most likely be like Q and entertain myself by bothering random people, preferably starship captains.
Or even being able to show emoticons or such IRL. Just think about it for a sec. "How was your P.E. lesson today?" "Hard, but not as hard as me" and then you put a :B1: Holy damn that's one big ass of power