About Gojo and Johnny.
I think we can divide this argument in 3 areas: Stats, Hax, and Trump Cards
>Stats
When it comes to power Johnny takes it no matter the approach, lowballed he still scales to the Holy corpse's spine who could create a storm that engulfed all of Kansas city and Love Train moving the Atlantic Ocean, highballs involve him being infinite in AP
Speed is a bit trickier because as a lowball Johnny and Gojo are roughly equals (maybe with a little edge for Gojo) midballs give Gojo the edge, but all the highballs give Johnny the edge in speed (even with Gojo's FTL scaling from Sukuna)
Out of 6 categories (low, Mid, and highs for both AP and Speed) Johnny Takes 4 (all the AP ones and Speed Highballs) and Gojo takes 2 (Speed low to midballs)
So stats go to Johnny
>Hax
Both combatants have a basic first Hax that has multiple alternative uses.
Gojo: Infinity, Red, Blue, and Purple
Johnny: Act 2, Act 3 and act 4
Gojo's Neutral infinity would protect him from Johnny's basic shots. But Act 2's sinkholes showcased the ability to move through dimensional barriers (act 2 managed to not only bypass Love Train's barrier but also ignore or reverse D4C's main dimension hopping ability) so at the very least that should be able to hit Gojo.
Red is a basic ranged attack, but blue could leave Johnny badly injured, but as long as he doesn't get instantly killed (something likely if we take his best possible speeds) he can answer with act 3 to become unreachable while also being able to shoot at gojo with act 2.
And while strong Hollow Purple is still bellow the lowballed AP estimates for Tusk act 4 so the humanoid stand should be able to defend johnny from it.
Overall Gojo's best trick is a surprise blue while Johnny's Act 2, and 3 are a superior offensive and defensive tactic, while also having act 4 as a defense against purple
Hax go to Johnny, unless...
1/2