(I know, I'm rather terrified of heights. A good 2-5 stories is refreshing, but after that, NOPE! XD)
In the sky, because I could have a parachute on me all the time. Having an oxygen mask all the time in the case of an emergency only goes so far. However, I'd be more likely to go to a place in the water for a shorter period of time, a month or less maybe.
Would you rather live in Antarctica for a year or on the International Space Station for a year?
I'm a wandering tactician, here to help those in need. My strategies are yours.