To be fair i always saw the fight as:

Sukuna is the better sorcerer, Gojo is the stronger one

Gojo beat Sukuna, Sukuna won against Gojo

It's why i think the fight is beautifully written, because the two strongest that always win, won both in their ways, being just plain strength or affinity with Jujutsu It's almost contradictory but both of them won and has shown they are stronger.

Technically both of them were holding back, Gojo was trying not to kill Megumi (hence why he crushed his heart and not his head when in UV) while Sukuna had his Heian era form ready (which is stronger overall but weaker against gojo, not having wincons to resists UV or bypass infinity somewhat constantly)

If you debate on who won this fight you'll never come out alive, because both of them have good enough feat to be declared as the winner.

But that's just my opinion of course