It would have to be invisibility for me, but I would have to have some kind of special (invisible) bag that I could put stuff in & hide it.
...you know, just having one of those bags would probably be good enough.
I'll go with bending space/time. This would give you the ability to stop time (I could get so much more sleep and never late for anything) and also let me travel forward and back through time. I'd give almost anything to go back and see loved ones that have passed away.