I'm probably going to say Scoobie Anya, always there to help and what not. Even after Hells Bells, she did care for Giles and be a scooby somewhat.
I just prefer Scooby Anya, helping out, being funny, having random outbursts and stuff.
You know, even after she went back to her vengeance demon days, I didn't think she was pure vengeance. She still helped out and stuff, and she seemed easier on Xander, as it showed in Two To Go.