It’s hard to pick just one. I was going to cheat and choose a power like the one Rogue from X Men has. She absorbs others’ powers when she touches them. But that would only work if you lived in a world where other people had powers too. And isn’t that a bit like wishing for more wishes with your wish from the genie?
So if I was the only one with powers, I think I’d like something like super speed, like Dash from the Incredibles. Imagine having all that energy!