Superman. Gravitron's a sitting duck without his shields, and Superman doesn't need super strength to KO him, but can still use his speed.
__________________ What CDTM believes;
Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.
Does he have super human durability at base levels, when he's not channeling shields?
If not, pretty sure active powers are off by default, and Superman doesn't need to use his super strength to tap him into unconsciousness right off (Especially if we're using current Superman, who became the dick Superdickery pretended PC Superman was.)
__________________ What CDTM believes;
Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.