King breaks it.
Either way, there's not really any reason for Zoro to take Nidai over Sandai
On a serious note, I alluded to my reason for why Zoro should keep the Sandai Kitetsu over the Nidai Kitetsu. The main reason being Sandai Kitetsu's longevity. It's been there for all of Zoro's Grandline battles, as well as his New World Battles. Unlike most of his other swords, it's the only one he's own that is patently his. There's never been an implication the sword's held him back, and by the time he has to replace it, we're already at the endgame.
The Nidai Kitetsu also doesn't seem all that different from the Sandai Kitetsu, being just another cursed sword. It presents no new challenge for Zoro to overcome in order to master it. Shusui was its weight and power output, Enma was its forceful haki consumption. Nidai Kitetsu? Just a cursed blade once more. It offers nothing new, while its time with Zoro would be comparatively brief before the series end.
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