Your favorite Serpentspines nation and why?

I'm goning to finish up a frost trolls game soon and I've always been eyeing the mountains with a greedy eye, I've played a few games within them but nothing complete.

My question is what is your favorite nation in the area? Why do you like them? This could be because of lore, or mechanics, or even just their color.

I will also accept multiple answers for different races, or if you just can't decide.