The actual Sukuna was a BEAST. Even in the 'Golden age of Jujutsu' where Jujutsu Sorcerers were at their peak, they couldn't defeat him. So yeah, he's pretty powerful. If Naruto were to be trapped in his domain expansion, the hits are confirmed.

Can Naruto defeat sukuna?

Sukuna's true power is still unknown, and it's possible he can defeat Naruto if he activates his domain expansion. But for now, Naruto remains the safe bet.

Is there anyone stronger than sukuna?

Sukuna is definitely stronger than Gojo at full strength. Although it seems Gojo is stronger than Sukuna on the surface, in reality, they're almost evenly matched!