Between Anders and Fenris, which is your fav.
I like Fenris because he's stronger and not as...what's the word I'm looking for...ah yes...depressing. Anders was pretty cool in Awakening, but once he came into DA:2 he seems so blah. I know that he's *SPOILER* merged with Justice, but dang. He doesn't have to be that down in the mouth.
I know that Fenris can have his moments of depression, but at least he likes to get down to business and doesn't let too much get him down.
I also think that Fenris is a much better fighting companion. Anders is a good healer, but he isn't so good at fighting.