Tbh, I chose invisibility.
I am REALLY nosey so my favourite superpowers are invisibility (<- do you realise how many i's are in invisibility?) and mind reading. If I had to choose a third it would probably be telekinesis. How awesome would it be to sneak up on people when your invisible and go "SURPRISE MUTHA FUDGA!!!"
All my friends choose things like flying but what happens if one day your "kryptonite" comes along when your flying then- *drops out of sky*becomes dizzybonnett pancake on pavement*
So, choose wisely...