Awakening Anders is whatever. Best Awakening Companion was Nathaniel.
The thing is though, DA2 Anders always existed. Awakening Anders hates Templars too. He places a huge value on his freedom, as well. It's just that he's such a spineless worm in Awakening that he can't go through with doing anything about any of it. He just whines now and then.
Justice gave him the gumption to start taking a stand.
Of course, the problem is that a human and a spirit are not supposed to do what these two did. You can't just jam two beings together and hope it all works out. The only reason I would ever kill Anders is because it's a merciful end for both Anders and Justice, who are prisoners more or less.
That's the Rivalry path though. I Friendmanced Anders and supported him all the way. His merger with Justice goes more smoothly in that scenario.