I picked Surface, although I have limited knowledge of the Fallout franchise to base my decision on.
My thought is that if I were transported to the Fallout universe and, assuming I would be at the same location as I'm currently at, I'd probably avoid some of the worst and have an easier time just avoiding other people.
I probably would plan to reach Anticosti Island, (remote, rich in resources and wildlife, very low population, and far from any population concentration that would have been a target of a nuclear strike )