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They're nothing near the same price. Hyakkas are going for like 1m a piece right now.

Granfol was something like 2m last I checked, plus the 8m you're going to have to spend on Fighter Addition,...

Purely for the sake of running UQ? Eh, I'd say you should keep it Light because it'll be always useful in the end, for Magatsu, Falz, Darkers, etc. But for UQ it'll only last until Lillipa UQ...