To all the people ranting about Sasuke trying to kill Sakura. You do realize she had just tried to kill him, don't you? In the words of Malcolm Reynolds, "When someone tries to kill you, you kill them right back."
That and the same exact thing can be applied to Karin. It does not matter how many times. You still tried to murder them.
i think Sakura is more likely because it is less unhealthy. Karin would be okay with anything Sasuke says she is mindless when it comes to Sasuke. Sakura at least tried to kill Sasuke. Moreover she is quite rationally unsure of his loyalties because of the whole stabbing thing. In conclusion, Sakura because she has motivations other than Sasuke.