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Flight, because it would just be so much fun. There's this one area of the Salmon River I just can't get to, but I could just glide right over there...
Plus, everything I can think to do with invisibility is, well, naughty in some way.
Flight because if you were swimming in the ocean and a rip current took you far out from shore and you were invisible then no one could find you and eventually a shark would eat you. Also what if you were out drinking and passed out on the sidewalk then people might kick you or step on your head? (I hate that). Instead you could just float above the streets until you woke up.
Flight, every time. Invisibility, meh. You'd get shoved a lot on the street and it would probably inevitably wear off on the day you decided that, since you were invisible, it really didn't matter if you were wearing lime green pants with pink plums on them and 4 layers of plaid flannel.
Well, you're invisible, not your clothes, so it'd follow that an invisible person would be naked all the time, which would either be a drawback or a bonus, depending on climate and inclination.
Flight, I guess, if it's a dualistic choice, because there are so many physics problems with invisibility I'd never trust it as superpower in a tight spot.
But if we could wish for a better superpower than either of these, I'd take super-empathy. The ability to truly, deeply understand other people instantly, and have that understanding as instantly and deeply perceived by those so understood, would be hugely useful.
I'd promise to use it first to advance the cause of whirled peas.
Still flight, because of the extras I'd want. Invisibility'd be ok, but then you'd have to make your clothes invisible too, or anything you wear. Or touch. (Think - it's freezing cold and you're wandering around naked. Ugh. Or you'd have to leave stashes of clothes places. Problematic.) And you're not immaterial, so it could make for some tricky situations.