Luigi has dozens of super forms thanks to the power of The Plants and items in the Mushroom Kingdom. Thunder Luigi can shoot massive bolts of thunder. Fire Luigi can shoot giant fireballs. Rock Luigi can turn into a rock and ram things. Luigi is definitely formidable, but Yoshimori has kekkai’s and zekkai’s. Yoshimori wins.

Since than I have seen some episodes of Kekkaishi and read more volumes. Yoshimori is good but he can’t beat Super Luigi. Luigi wins.

But since then the truth has been even more apparant and Yoshimori is tougher. Yoshimori wins.