You get to choose one superpower, what do you choose?

Technomancy: control over machines and electronics

I'd use it for selfish reasons:

Insurance claims getting denied? "Oh! the system says that's an approved procedure"

Low on funds? That ATM over there is vomiting cash

Need to sneak into a place? The cameras are showing a normal empty hallway

Credit card debt? Not when the system shows that you paid it off already