At a glance, Hitoshi is definitely more versatile in terms of abilities, Especially with reality warping and immortality at his disposal. Only problem is, Saitama is probably stronger in AP (Kept up with popeye, who could send the sun flying in the animation) and therefore just as durable too, and he could also restrain hitoshi (LS) and, also, Hitoshi can't survive in space, at least for very long (Doesn't have self-sustenance or extreme temp resistance like saitama has, just radiation resistance and thats it) Heck, vegeta himself said that saiyans cant breath in space himself (canonically) So with all that, saitama definitely has a chance of at least outlasting him.
Not voting either for now, but watching