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All joking aside, it's funny they're considered rivals in this thread, because they really aren't rivals IRL. Matt C. is the lead writer for Matt M.'s Vox Machina: Origins comic, for example.
Colville only wrote the first series of Vox Machina: Origins, and if I'm being honest, some of the "Colvillisms" in that series (Asssassin School) are why I downvoted him. But he was also meant to be an important reoccurring guest on CR campaign 2 before the party went a different direction.