In rough order:
1) The Illians. Yeah, they're pretty much fascists. So? It's not like anyone else is much nicer to foreigners, and at least they're all united behind promises of a glorious future. Besides, Mulcarn was always the least evil of the Evil Gods.
2) The Svartlafar. I imagine you could just keep your head down and get by okay. You won't get backstabbed so long as nobody views you as a threat. Or an inconvienence.
3) The Balseraphs. So long as you don't draw the attention of Perpentach, you're relatively safe. There's also lots of fun stuff to do in the Balseraph lands, and you never lack for entertainment. They're ranked below the Svartlafar and Illians only because your next batch of entertainment could randomly turn out to be the one where your soul gets stolen or you get mutiliated horribly and cast out of society.
4) The Clan of Embers. Everyone on Erebus hates you, and your society is savage and warlike. You also mostly lack the comforts of civilization. These guys come in fourth because the next three are even worse.
5) The Doviello. Much like the clan, except there's not a trace of noble savage in your society. These people are crazy. If you're weak under the Clan, you might be considered worthless; if you're weak under the Doviello, you get eaten. Plus they use the corpses of their enemies as improvised weapons, for Junil's sake.
6) The Calabim. Far, far worse than any of the above, because the society is saturated with despair. There is no hope for escape. There is no hope of finding meaning in your life. You exist for the sole purpose of being eaten by your vampire overlords.
7) The Infernals. Your will is stripped from you, you are tortured and twisted into an unfeeling monster, your world is filled with horrible flames and sulfur, and your only desire is to spread your misery on to others in what amounts to a petulant child's dramatic act of protest.