Versatility? do you even watch db?
these dudes can manipulate their ki to do whatever they need. And wtf do they need to breath in space for? Goku fought beerus in space no problem. Superman is not even close to the best DC hero either he is the most boring, generic and uncreative super hero there is.
Toriyama said that was upper edges of the atmosphere. But then he gave an inconclusive answer like "they are aliens so who knows?"
There is more evidence ta they can't.
Goku had to wear a full on suit to survive in earth's core. DBS episode 68 btw.
Supes does this no problem.
When Freeza blew up Earth, Vegeta and the half-sayains died. There is only two possible explanations.
1) Vegeta's durability peaks at planet busting attack. Which makes no sense DB at this point is beyond that.
2) nikka can't breathe in space.
It's #2
And yeah, versatility. Once a Kryptonian absorbs different types of radiation you get people like H'el who has; telekinesis on the atomic level, telepathy, size alteration, teleportation, astral projection and time manipulation. There are other beings with different powers too.
Ki is versatile too but unless you are a prodigy, yo need someone to teach you those specific techniques. Like I posted before most of Goku's arsenal is not self taught. Even flying was something he had to learn from Tien and the Crane School. Along with Gohan teaching Goten how to fly. Saiyan have fast combat speed but trash travel speed compared to a Kryptonian.
These abilities aren't as innate as a Kryptonian's is. Sure I might melt a car down with heat vision but eventually I will get it.
Saiyan's have to train to grow stronger.
Kryptonian's are already a step above and just have to train control and refinement.