Flight would be cool, but I admit that I'd worry about getting cold up there. Also, if I could fly everywhere, why would I bother walking? Does flying burn off calories? Nobody wants to look up in the sky and see a big fat man with a feeble pair of atrophied legs dangling below him.
What about invisibility? The only legitimate use I can think of for it is spying on people, and becoming a pervert. Firstly, I don't want to know what people are saying about me. There's a reason why I don't ego-surf. These days. Also, it would depend on whether my clothes became invisible too. Would I have to walk around in the nuddy? I'm not sure I'm comfortable with that. Also, what if I got cold?
Being able to breath underwater like Aquaman? It's alright if you live at the seaside, I guess, but the main thing that puts me off going swimming is all the faff of having to get dry and changed afterwards. Plus, it's probably really cold at the bottom of the ocean, and it's not like you can go swimming in a thick woolly jumper.
Actually... now that I think about it, it seems my choice of superpower would be dependent on whether it made me feel cold or not.