Musings on Superpowers

When offered any superpower imaginable, why would anyone choose invisibility? How would that even be helpful as a superpower? I mean, I can understand that it would make it difficult for villains to find you, but how does it help you save people? I think that super strength would be a much more helpful superpower when it comes to saving people.  Either that or mind control, but you'd have to be careful or you might use that power for evil. Teleportation and flight would be pretty cool, but only really useful after you already saved someone and need to get out of there.