The Nagas have a fresh take on the race itself, and the Inferno creatures are also designed from scratch.
The campaign featuring Anton is the most boring (the missions are inconsistent, with 3-4 missions featuring only one enemy race and a lot of castles, and battles are almost without losses for the "hero"). And he himself is neither fish nor fowl (he was a supporter of Elrath - he backed down, he killed the Nagas - he saw that his sister was in charge - he drank tea and left). The second and third missions have very little narrative value (except for the underground with Kate and Kirill, but this is more of an additional element). Whereas in Nastya's campaign, all the episodes develop a single storyline.