I don't see Ulquiorra winning if he has no knowledge of Whitebeard. Which he doesn't here, so i'll go with whitebeard 9/10.
i am going 50/50 for this battle both can one shot each other.
True, but WB is faster IMO as he could intercept Kizaru so I see him taking it.
After all, WB is a top tier in OP while Ulq is only a mid tier