So since the clones were beaten let's have a true total war. The entire existence of mandolorians vs the whole Spartan army. That means the whole planet and every mandolorian that has ever existed will fight the Spartans. Vehicles and all there will be no bounds. Goodluck and may the fanboy be with you
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Question is pointless, for there are none greater than the Space Marines of His Holy Imperium. If i had to pick though, I'd choose Mandos. Because there are a shit ton more of them than there are Spartans. Kal Skirata and his group would either rek the Spartans without even trying, or he'd go Father Figure on them and cause them to desert the UNSC. ^Probably not, it'd probably be a ridiculously close fight if it came to it.