Even though I have a much higher chance of being found in the ocean, and I actually know how to survive there with minimal supplies... I'm going with space, all the way.
1. Zero-gravity is awesome, and I much prefer it to a constantly rocking ocean raft which would probably make me throw up.
2. I've never seen the inside of a spaceship, while I know exactly what a raft would look like.
3. A raft has no technology, like, at all. In it's simplest form, it can literally just be a piece of wood that floats in water. A spaceship, on the other hand... Even without fuel, the tech up there will be crazy. I highly doubt they don't have 1, if not multiple, super high-tech radios that would function from tens, hundreds even, of miles away, even without much fuel. Like honestly, if I have a 6 pack of AA batteries, I can get out of there whenever I need to.
4. If aliens exist, I might see them. So that's cool, I guess.