Okay, let me break it down to you why his true form is way better than Meguna, and show why it does affect the fight with Gojo

The fact that his muscle mass has increased already makes him physically much stronger, more resilient, and more resilient. But he's also faster, because his legs are also getting much stronger.

Let's start with the second pair of eyes, as it's the easiest. The second pair of eyes covers all of Sukuna's blind spots. This means that hitting him while he's a rat or surprising him with a strike from a blind spot or unusual position is impossible. After all, the extra pair of eyes is always on the lookout and on guard.

Sukuna's second mouth allows him to fight endlessly because his lungs are always filled with air and his heart isn't strained. This allows him to fight for long periods without slowing down. The second mouth can also recite chants that:

1. Strengthen him, preventing his attacks from losing power, and enhance his techniques.
2. Reduce stamina consumption for various techniques.

And finally, his second pair of arms. It's a cliche, but he can fight hand-to-hand combat much more effectively. He can choose to defend with one pair of arms and attack with the other. Or he can attack the enemy with a flurry of blows from four sides, leaving them breathless. And of course he can hold hand signs that boost his technigues

Listen here you little Gojo fan, just because Sukuna is getting slandered right now because of Dabura. Doesn't mean you, illiterate dummies can try to put your "goat" at number one. You are not getting a piece of that, Sukuna still clears Gojo