I'd pick Invisibility over flight.
Flight is for posers, show-offs, and beingshot down because some retard things you're a small plane heading for another skyscraper.
Invisibility is for being able to blow those skyscrapers up because no one will see you put the bombs there, also it leaves more options for theft, robbery, spying, murdering etc.. (There is another thing that starts with r and is considered "not nice" which would also be pretty easy if your invisible.)
Some might be shocked by the possibilities I am listing here but if I'd really got my hands on invisibility, you'd be fools to think I'd just live a boring normal life with a few little thiefish doings...I'd go crazy, leaving a trail of bodys behind me.
(Should pay attention to heat detectors though, those could be a problem...)
So long
UnterHund