Man, its a hard choice, the majority of people would normally choose something like flight or super speed, for me, the ability to stop time would probably be my first pick, yes it would be a robbers best friend, but think of all the things you could do with it. Given that you don't age nor require food and drink, and all known physics go out the window, you could probably spend hundreds if not thousands of years cleaning up the planet, you could rid the world of pollution, work on cures for harmful diseases, save people from possible accidents. You would have an eternity, to solve all burdens humans have put on this planet, plus I could get my homework done.
The thought of just pausing all of existence just seems like such an omnipotent act, that could be used for so much good. With the way the worlds headed, we will probably end up extinct before a flying rock can do us in.
Yeah flying and super speed would be pretty cool, but life doesn't last forever, this question has been a good reminder to always keep your head held high, feet on the ground, and live life to the fullest, try to be the person you strive to be, even if that is a bank robber who can stop time.
-ShadowYt2004 :3