So what do we think about Revna vs Hel? I'll try to make it spoiler free as much as I can.
I don't trust either of them (and my choice probably depend on my Lis) but if I have to choose, I'd choose Hel, hands down.
Like both of them are very manipulative, but at least with Hel, she is upfront. She was unorthodox and ruthless and you're pretty much being served that from the get-go. Yes, she had no qualms with sacrificing people, but she did that to save countless others (if we're assuming she is genuine in her concern for others).
Revna... She's very selfish and that is not even scratching the surface of what an awful person she is. The first time she met you she scorned you if you help the Alders with clothes. Then the whole Kare sacrificing his own apprentice and Revna just said, "You don't owe them anything", like hell he didn't owe his apprentice who knew nothing and got eaten on his behalf nothing. Yeah, she wants to build sanctuary for the exiles, but at the same time, she is an exile so it's not a charity on her behalf either. Like, if you get help from her, you bet your ass that only happened because you're so happen to be in her interest.
Hel would sacrifice a bunch of people to save tons other, while Revna would sacrifice other to save herself, it's just that so happen she is the leader of the Exiles.