Well I kind of feel like pretentiously pointing out how it was made reasonably clear that Terezi was hoping to kill Vriska in a long-winded post that touches upon all the stuff we've learned about trolls over this arc but even writing this much is making me feel like a colossal asshole so I think I'll leave it like that.
I see what you did there.
I don't remember saying she wasn't out for vengeance, but she wasn't out for death. She was out for vengance for killing and crippling two of her friends by giving Dr. Scratch a reason to take vengeance on Vriska. As opposed to telling somebody to kill a friend of yours and throwing another off a cliff with no real control over if the friend is paralyzed or just dies from the fall.
And I say she was out for death. She kills people all the time. She killed plenty of trolls with Vriska when they were still working together. She executed Senator Lemonsnout. She even hung nooses around the necks of the statues in her magical land. That's what she does. Orchestrate the demise of the wicked. Vriska was wicked, and her demise was orchestrated. But Doc Scratch failed to kill her all the way, and before Terezi had a chance to rectify this matter, she was blind, and then the pointless cycle of revenge was interrupted by their truce.
Also, I seem to recall that just a few posts ago, I was urging others to STOP bickering about who tried to kill who. I'm not sure what happened here.
Anyway, I think they're both badass. Vriska might not be a nice person, but she's a really interesting character. Terezi might be kind of terrifying with her keen sense of personally administered justice, but she's too cool for me to dislike. And although Vriska definitely deserves all the bad things that happen to her, I still sympathize with her. It can't be easy to always have karma work against you because of all the terrible things you did. Thus, my interpretation of the Trollflash as a positive growing experience for all parties involved. Leading to my interpretation of the whole concept of Sburb/Sgrub as a growing experience for the players. I love my deranged theories and they love me.