Well looking at it
Lifting Strength
Superman can casually
overpower people who in some fashion scale to Doomsday/MoS Superman who can preform a 2.15315117803153e+11 kgf feat
Garou scales to two people who preformed a 4.000748046e+9 kilogram feat. Which is important since Bomb caught Garou's punch and all that.
So Superman is at the very least 53.81-107.63x times stronger. Or 4,268,211,995,272.446 times stronger with the Tectonic Plate feat. Garou cannot physically compete with Superman in a grappling contest.
Attack Potency
Garou upscales from a
837 Megaton attack and a
715.8 Megaton attack from characters who are vaguely agreed to scale to vaguely above baseline 1 Gigaton.
Superman while being actively weakened overpowered a
1.79 Gigaton beam. Then went on to get much stronger in the SynderCut to the point where a character who is stated to be superior to Doomsday was incapable of even damaging
him with a axe attack.
Garou's scaling starts somewhere around 1 Gigaton while a much weaker Superman is slightly superior compared to the version being used here. So overall I'd say Sueprman has a solid AP edge but also not like, a "in one shot range" one. Though he is significantly more durable than Garou.
Skill
Garou has
body reading and the ability to make predictions based on
various factors. Now an issue I should mention here is that due to speed equalization Garou isn't going to be some auto-dodge monster in the same fashion that Awakened Cockroach would be, but it means that the amount of hits that Superman is solidly landing is significantly lowered since he has no skill feats of his own.
Garou isn't dominating a CQC fight at the start of the match due to the AP and LS difference, but if he lasts long enough there is a chance he closes the strength gap where at that point the fact he's landing dozens of hits to Superman's one will be a legitimate major factor.
Heat Vision speed scaling
Superman's heat vision is superior to his normal speed by some unknown vague amount. The pre-SynderCut key scales is scaling 23% SoL to 100% SoL, so Superman's heat vision is 4.347x times faster than his base speed, which means that for the match up his heat vision is 4.347x faster than both him and Garou. Now how good it is in the fight is debatable since his heat vision really doesn't have any temperatures that Garou couldn't withstand really.
Though in my view heat vision will rather consistently hit Garou for the following reasons:
- Orochi's heat beams hit him
- Rover's heat blasts hit him
- He was notably slower than all of Genos' heat beams and had to rely on visual cues to actually dodge them
Superman's heat vision can trigger just as fast as Rover's blasts or Orochi's beams and they have no clear windup like with Genos' heat cannons. Now if this matters in any real capacity is questionable since Superman is more punch than heat blast, though it should be noted that SynderSuperman is far more gritty than most versions of the character so him maiming Garou seems in-character.
Overall
If the match ends within a couple of relative minutes it would be Superman who ends it. With his superior AP and LS overcoming Garou's skill gap due to the oppressively nature of them with their scaling differences.
If the match doesn't end within a couple minutes then Superman likely loses to a death of a thousand cuts. At some point Garou will be just as strong as he is so his ability to inflict real damage will be questionable with the equally oppressive skill gap and his only real option is space BFR, which would require restraining Garou in a way he can't counter attack and flying up to space fast enough. Which
while possible I question how realistic that is.
Overall idk, but if as the fight goes on I back Garou more than I do Superman. But if it doesn't go on Superman wins via swoleness.