in the same light of what the guy under me said. to place a renegade over a guardsman, or vice versa is rather relative, since quality varies widely as both can either range from being well trained elite units, or little more than armed mobs. so in this case, it can't really be taken as representations of either one as a whole.
perhaps make it a tyranid instead? or just any one not of the same species.
The Traitor Guardsmen used here (from the game Space Marine) were actually trained units before they were curropted by Chaos, and were part of the Imperial Regiment defending the Forge world, who were Cadians, who have standard equipment.
While it's true most Renagades are PDF, there are a few ACTUAL regiments that turn to the Dark Powers.