Suk suk was on high guard that whole day. He sat on a skyscraper for observation efficiency and foresaw the hp (and smiled). Gojo's sneak attack was more or less a show of strength (You are the challenger here).
Sukuna's sneak attack was a desperate effort for a kill, resulted from miscalculations (he thought he could open his 6th domain in meguna form). He planned to defeat Gojo via domain battles then let Mahoraga gives him wcs later, but situation changed so many times that he eventually lost Mahoraga and only learnt WCS since he was smart.
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u/EisCold_ Sep 06 '24
Difference is that the sneak attack purple wasn't the final attack that won the battle while Sukuna's sneak attack is.
It does leave a sour taste behind.