Grendel_Khan
Hero
If whatever system you pick has too large of a gap between normal and supers, you could steal an idea from that series - each super has a weakness, and finding that out could be leveraged for a chance for victory.
@Reynard isn't into PbtA (not a swipe, honestly, just mentioning for context) but this makes me think Monster of the Week could be a fun way to do supes-hunting, especially with its focus on weaknesses.
I know I'm a broken record with this point, but I don't really like how almost any game does superpowers, especially with mixed power levels...except for more narrative systems. If you're a non-supe, we don't need to know how may hexes Homelander can throw a car at you (all the hexes), and how many handfuls of dice to roll for damage. We just need to know if you got out of the way, or hit him first, or someone else intervened. Otherwise, roll all the dice you want, you're still just a dead person under a car.