Probably the Anglean Republic for me
They seem like the tough, scrapyard miracle makers that pull through due to sheer knowledge of advanced technology.
They are motivated by the pursuit of understanding and not even the coldest, harshest barren wastelands will stop their curiosity.
Not only that but living in such conditions make their culture based on being crafty, resourceful, and adaptive.
They are resilient engineers/archeologists/scientists.
What they lack in natural talent, discipline, and tactics they make up for in being cold and calculating (literally).