In the story’s current canon, Sukuna ends up being portrayed as stronger overall, but many details show that Gojo is at least equal to, and in some respects superior to, Sukuna in a fair 1‑on‑1 fight.

What the creator said

• The author Gege Akutami has explained that Gojo lost because he let his guard down and misread the situation, not because he was absolutely weaker in raw ability.

• Gege also indicated that in “normal circumstances,” with full focus, Gojo would have won, meaning Gojo is the stronger sorcerer individually, even though Sukuna won the actual battle in the manga.

How the fight plays out

• In their Shinjuku showdown, Gojo dominates large portions of the fight, repeatedly outpacing and outdamaging Sukuna until Sukuna adapts using Mahoraga and new techniques to bypass Infinity.

• Sukuna ultimately kills Gojo by exploiting that adaptation plus a momentary lapse in Gojo’s concentration, so in the official story Sukuna is the one who walks away as “the strongest” at that point in time.

Simple takeaway

• Pure 1v1, no external help or adaptations, the author’s comments lean toward Gojo being stronger.

• In the actual canon outcome, with Mahoraga’s adaptation and strategy taken into account, Sukuna surpasses Gojo and stands as the top power by the end of their fight.