Goku easily. Being a workoutaholic I'd continue to get stronger which to me is a helluva lot better than just sitting on my ass and getting powers that have limits. Also my desire to learn more about the afterlife and other workings of the universe would be sated by just teleporting to the check-in or Supreme Kais world. From there I could just focus somewhere and teleport to a world full of people in other parts of the universe and learn more that way. Instantly. Plus the Kamehameha is So Much Cooler than Heat ray vision.